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In a shocking attack early Sunday morning, Omar Mateen opened fire inside Pulse, a gay nightclub in Orlando, Fla., killing at least 49 people and injuring 53 others before being taken out by police.

In the hours following the massacre, the worst in modern U.S. history, Mateen's father, Seddique Mir Mateen, described to NBC News his son's alleged homophobia and how it may have motivated the attack.

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"We were in downtown Miami, Bayside, people were playing music. And he saw two men kissing each other in front of his wife and kid, and he got very angry," Seddique Mir Mateen told NBC News. "They were kissing each other and touching each other, and he said: 'Look at that. In front of my son, they are doing that.' And then we were in the men's bathroom, and men were kissing each other."

Authorities are also investigating an apparent connection between Mateen and the Islamic State, who has since claimed responsibility for the shooting.

Following Sunday's violence, victims' families, the LGBT community, their allies, and supporters from around the world gathered to mourn victims at impromptu vigils. These are just some of the most moving images to have been released so far.

Orlando

A message of the screen during a prayer vigil at the Joy Metropolitan Community Church after a fatal shooting at the Pulse Orlando nightclub Sunday, June 12, 2016, in Orlando, Fla. (AP Photo/Chris O'Meara)
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Judy Rettig, left, cries with her partner of 43-years Christine Santoro while taking part in a prayer vigil at the Joy Metropolitan Community Church after a fatal shooting at the Pulse Orlando nightclub Sunday, June 12, 2016, in Orlando, Fla. (AP Photo/Chris O'Meara)
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Orlando Police Lt. James Young hugs Karen Castelloes after a prayer vigil at the Joy Metropolitan Church after a fatal shooting at the Pulse Orlando nightclub Sunday, June 12, 2016, in Orlando, Fla. (AP Photo/Chris O'Meara)
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People wait outside the emergency entrance of the Orlando Regional Medical Center hospital after a shooting involving multiple fatalities at Pulse Orlando nightclub in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)
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Jermaine Towns, left, and Brandon Shuford wait down the street from a multiple shooting at a nightclub in Orlando, Fla., Sunday, June 12, 2016. Towns said his brother was in the club at the time. A gunman opened fire at a nightclub in central Florida, and multiple people have been wounded, police said Sunday. (AP Photo/Phelan M. Ebenhack)
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ORLANDO, FL - JUNE 12: Orlando (did not want to provide his last name) (2nd L) who was injured in the mass shooting at the Pulse Nightclub attends a memorial service at the Joy MCC Church for the victims of the terror attack where Omar Mateen allegedly killed more than 50 people on June 12, 2016 in Orlando, Florida. The mass shooting killed at least 50 people and injuring 53 others in what is the deadliest mass shooting in the countryÕs history. (Photo by Joe Raedle/Getty Images)
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ORLANDO, FL - JUNE 12: Mourners attend a memorial service at the Joy MCC Church for the victims of the terror attack at the the Pulse Nightclub where Omar Mateen allegedly killed more than 50 people on June 12, 2016 in Orlando, Florida. The mass shooting killed at least 50 people and injuring 53 others in what is the deadliest mass shooting in the countryÕs history. (Photo by Joe Raedle/Getty Images)
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ORLANDO, FL - JUNE 12: Orlando (did not want to provide his last name) who was injured in the mass shooting at the Pulse Nightclub cries as he attends a memorial service at the Joy MCC Church for the victims of the terror attack where Omar Mateen allegedly killed more than 50 people on June 12, 2016 in Orlando, Florida. The mass shooting killed at least 50 people and injuring 53 others in what is the deadliest mass shooting in the countryÕs history. (Photo by Joe Raedle/Getty Images)
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ORLANDO, FLORIDA - JUNE 12: Christine Leinonen, 58, waits for information outside of the Orlando Regional Medical Center about her son Chris who is missing after a fatal shooting and hostage situation at Pulse nightclub on June 12, 2016 in Orlando, Florida. The suspected shooter, Omar Mateen, was shot and killed by police. 50 people are reported dead and 53 were injured. (Photo by Gerardo Mora/Getty Images)
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ORLANDO, FLORIDA - JUNE 12: A man holds a sign in support of the victims of the terror attack at gay nightclub Pulse on June 12, 2016 in Orlando, Florida. The suspected shooter, Omar Mateen, was shot and killed by police. 50 people are reported dead and 53 were injured in what is now the worst mass shooting in U.S. history. (Photo by Gerardo Mora/Getty Images)
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A group of people walk to the emergency room of Orlando Regional Medical Center after a shooting involving multiple fatalities at a nightclub, Sunday, June 12, 2016, in Orlando, Fla. (AP Photo/John Raoux)
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Family members wait for word from police after arriving down the street from a shooting involving multiple fatalities at Pulse Orlando nightclub in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)
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Terry DeCarlo, executive director of the LGBT Center of Central Florida, center, is comforted by Orlando City Commissioner Patty Sheehan, right, after a shooting involving multiple fatalities at a nightclub in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)
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Volunteers wait in line to donate blood at the OneBlood blood bank after a shooting involving multiple fatalities at a nightclub, Sunday, June 12, 2016, in Orlando, Fla. (AP Photo/John Raoux)
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ORLANDO, FL - JUNE 12: (At right) Renee Solita and fiance Doug Comanko share a moment on the edge of Lake Eola, where candles were placed for the victims of the nightclub shooting, June 12, 2016 in Orlando, Florida. The shooting at Pulse Nightclub, which killed 50 people and injured 53, is the worst mass-shooting event in American history. (Photo by Drew Angerer/Getty Images)
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ORLANDO, FL - JUNE 12: Candles sit on the edge of Lake Eola, June 12, 2016 in Orlando, Florida. The shooting at Pulse Nightclub, which killed 50 people and injured 53, is the worst mass-shooting event in American history. (Photo by Drew Angerer/Getty Images)
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ORLANDO, FLORIDA - JUNE 12: Terry DeCarlo, executive director of The LGBT Center (Gay, Lesbian,Bisexual, Transgender Community) of central florida on North Mills cries near the scene of the Pulse nightclub terror attack on June 12, 2016 in Orlando, Florida. The suspected shooter, Omar Mateen, was shot and killed by police. 50 people are reported dead and 53 were injured in what is now the worst mass shooting in U.S. history. (Photo by Gerardo Mora/Getty Images)
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Las Vegas

Two people embrace during a vigil at The Center, a community center for the LGBT community, Sunday, June 12, 2016, in Las Vegas. The vigil was for the victims of the Pulse nightclub shooting in Orlando. (AP Photo/John Locher)
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Los Angeles

Miami

Caleb McGrew, right, wipes tears as he stands with his partner Yosniel Delgado Giniebra, center, during a vigil in memory of the victims of the Orlando mass shooting, Sunday, June 12, 2016, in Miami Beach, Fla. A gunman opened fire inside a crowded gay nightclub early Sunday, before dying in a gunfight with SWAT officers, police said. (AP Photo/Lynne Sladky)
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New York City

A woman cries and holds flowers in front of a makeshift memorial to remember the victims of a mass shooting in Orlando, Fla., in New York, Sunday, June 12, 2016. A gunman opened fire inside a crowded gay nightclub early Sunday before dying in a gunfight with SWAT officers. (AP Photo/Andres Kudacki)
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San Francisco

Berlin, Germany

BERLIN, GERMANY - JUNE 13: A visitor places flowers at a makeshift memorial during a vigil for victims of a shooting at a gay nightclub in Orlando, Florida the previous day, in front of the United States embassy on June 13, 2016 in Berlin, Germany. Fifty people were killed and at least as many injured during a Latin music event at the Pulse club in the deadliest mass shooting in the United States and the worst terror attack there since 9/11. The American-born gunman had pledged allegiance to ISIS, though officials have yet to find conclusive evidence of his having any direct connection with foreign extremists. (Photo by Adam Berry/Getty Images)
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BERLIN, GERMANY - JUNE 13: Members of the German Green Party (Partei Bündnis 90/Die Gruenen) place flowers during a vigil for victims of a shooting at a gay nightclub in Orlando, Florida the previous day, in front of the United States embassy on June 13, 2016 in Berlin, Germany. Fifty people were killed and at least as many injured during a Latin music event at the Pulse club in the deadliest mass shooting in the United States and the worst terror attack there since 9/11. The American-born gunman had pledged allegiance to ISIS, though officials have yet to find conclusive evidence of his having any direct connection with foreign extremists. (Photo by Adam Berry/Getty Images)
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BERLIN, GERMANY - JUNE 13: A mourner attends a vigil for victims of a shooting at a gay nightclub in Orlando, Florida the previous day, in front of the United States embassy on June 13, 2016 in Berlin, Germany. Fifty people were killed and at least as many injured during a Latin music event at the Pulse club in the deadliest mass shooting in the United States and the worst terror attack there since 9/11. The American-born gunman had pledged allegiance to ISIS, though officials have yet to find conclusive evidence of his having any direct connection with foreign extremists. (Photo by Adam Berry/Getty Images)
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BERLIN, GERMANY - JUNE 13: A mourner attends a vigil for victims of a shooting at a gay nightclub in Orlando, Florida the previous day, in front of the United States embassy on June 13, 2016 in Berlin, Germany. Fifty people were killed and at least as many injured during a Latin music event at the Pulse club in the deadliest mass shooting in the United States and the worst terror attack there since 9/11. The American-born gunman had pledged allegiance to ISIS, though officials have yet to find conclusive evidence of his having any direct connection with foreign extremists. (Photo by Adam Berry/Getty Images)
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Mumbai, India

Students at an art institute in Mumbai, India, light candles after making a mural with colored powder as a tribute to those killed in the Sunday June 12, 2016 mass shooting at a gay nightclub in Orlando, Florida, Monday, June 13, 2016. The nightclub shooting which killed at least 50 people and was the deadliest U.S. mass shooting to date. (AP Photo/Rafiq Maqbool)
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Seoul, South Korea

People hold candles during a vigil to pay tribute to the victims of yesterday's Orlando shooting in Seoul, South Korea, Monday, June 13, 2016. The vigil was held for victims of the Orlando nightclub shooting which killed at least 50 people and was the deadliest U.S. mass shooting to date. (AP Photo/Ahn Young-joon)
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Sydney, Australia

A man kneels in front of an impromptu memorial set up in Sydney, Monday, June 13, 2016, following the Florida mass shooting at the Pulse Orlando nightclub where police say a gunman wielding an assault-type rifle opened fire, killing at least 50 people and wounding dozens. Australian Prime Minister Malcolm Turnbull said that the Orlando mass shooting was "an attack on all of us — on all our freedoms, the freedom to gather together, to celebrate, to share time with friends." (AP Photo/Rick Rycroft)
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SYDNEY, AUSTRALIA - JUNE 13: A man touches the ground next to rainbow flags during a candlelight vigil for the victims of the Pulse Nightclub shooting in Orlando, Florida, at Newtown Neighbourhood Centre on June 13, 2016 in Sydney, Australia. 50 people were killed and 53 injured after a gunman opened fire on people in a gay nightclub in Florida. It is the deadliest mass shooting in US history. (Photo by Daniel Munoz/Getty Images)
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SYDNEY, AUSTRALIA - JUNE 13: A woman holds a banner during a candlelight vigil for the victims of the Pulse Nightclub shooting in Orlando, Florida, at Newtown Neighbourhood Centre on June 13, 2016 in Sydney, Australia. 50 people were killed and 53 injured after a gunman opened fire on people in a gay nightclub in Florida. It is the deadliest mass shooting in US history. (Photo by Daniel Munoz/Getty Images)
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SYDNEY, AUSTRALIA - JUNE 13: People attend a candlelight vigil for the victims of the Pulse Nightclub shooting in Orlando, Florida, at Newtown Neighbourhood Centre on June 13, 2016 in Sydney, Australia. 50 people were killed and 53 injured after a gunman opened fire on people in a gay nightclub in Florida. It is the deadliest mass shooting in US history. (Photo by Daniel Munoz/Getty Images)
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SYDNEY, AUSTRALIA - JUNE 13: A woman places a banner next to the candles during a candlelight vigil for the victims of the Pulse Nightclub shooting in Orlando, Florida, at Newtown Neighbourhood Centre on June 13, 2016 in Sydney, Australia. 50 people were killed and 53 injured after a gunman opened fire on people in a gay nightclub in Florida. It is the deadliest mass shooting in US history. (Photo by Daniel Munoz/Getty Images)
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SYDNEY, AUSTRALIA - JUNE 13: A woman writes a message during a candlelight vigil for the victims of the Pulse Nightclub shooting in Orlando, Florida, at Newtown Neighbourhood Centre on June 13, 2016 in Sydney, Australia. 50 people were killed and 53 injured after a gunman opened fire on people in a gay nightclub in Florida. It is the deadliest mass shooting in US history. (Photo by Daniel Munoz/Getty Images)
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Daniel Rivero is a producer/reporter for Fusion who focuses on police and justice issues. He also skateboards, does a bunch of arts related things on his off time, and likes Cuban coffee.

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David Matthews operates the Wayback Machine on Fusion.net—hop on. Got a tip? Email him: david.matthews@fusion.net