CNN evacuated its entire headquarters in New York City’s Columbus Circle on Wednesday morning after a bomb threat.

The evacuation happened shortly after 10 a.m. Reporters first started tweeting pictures after leaving the building. The device was allegedly comprised of “a pipe and wires,” per Vice News.

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The evacuation occurred shortly after the Secret Service revealed that explosive devices had been sent to both Hillary Clinton and Barack Obama. It was unclear whether there was any link between the incidents, though CNN’s Brian Stelter reported that the device appeared to be “similar” to the one sent to the Clintons.

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CNN President Jeff Zucker sent out a note to staff saying that the center had been evacuated due to a “suspicious package” in the mailroom, urging staff to remain “calm and patient.”

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Here’s footage of anchors Jim Sciutto and Poppy Harlow immediately rushing off air (looks like they went to commercial, then passed the broadcast to another non-NYC studio) after hearing alarms in the background.

Sciutto and Harlow took the broadcast back from the street after the evacuation:

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Update, 11:33 a.m. ET: CNN’s Jake Tapper reported that the suspicious package was addressed to former CIA director John Brennan. Brennan is currently a contributor to NBC News and MSNBC and has been a vocal critic of Donald Trump.

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Update, 11:48 a.m. ET: CNN President Jeff Zucker updated his staff on the situation, saying that the network’s other bureaus around the world look clear at the moment:

As a follow up to my earlier note, we remain on alert in New York. The NYPD is currently in the building assessing the situation. I can confirm that we have checked all of our other bureaus worldwide, and have found no other devices at this time.

I promise to keep you updated on a regular basis with any new information. Please do your best to remain calm and patient. As I mentioned earlier, if you would feel more comfortable leaving the area, please do. If you do, please keep up communications with your colleagues.

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This story is developing and will be updated.