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Pope Francis celebrated Mass in Havana, Cuba on Sunday morning, leading hundreds of thousands in prayer.

The Vatican reportedly estimated that at least 300,000 people turned out to see the first-ever Latin American pope in Havana's Plaza de la Revolución.

Francis is in the middle of an historic 10-day tour of the Americas. After Cuba, he will travel to the United States. Francis has played a key role in the ongoing reconciliation between the two countries. He also hopes to strengthen the position of the Catholic Church inside Cuba. Historically, the church has had an extremely tense relationship with the Cuban government.

At the mass, Francis called upon the crowd to "care for and be at the service of the frailty of your brothers and sisters. Do not neglect them for plans which can be seductive, but are unconcerned about the face of the person beside you."

The Vatican later told reporters that Francis also met with former Cuban president Fidel Castro, who has been reclusive for much of the last decade. The two met for 30-40 minutes, a Vatican spokesperson said.

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Below, see images of the mass.

Fusion is airing a documentary on Pope Francis, "Saint or Sinner," at 8 PM on Sunday night.

Francis arrives in the Popemobile. (Photo by Carl Court/Getty Images)
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The crowd. (Photo by Carl Court/Getty Images)
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Mass. (Photos by Carl Court/Getty Images)
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Waving the flag. (Photos by Carl Court/Getty Images)
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