Students at Ivy League schools witnessed a "chaotic" scene after each campus locked down following a string of unfounded bomb threats.

Yale, Cornell, Columbia and Brown all reported bomb threats over the past three days and have ordered evacuations from multiple buildings. 

Cornell University buildings viewed from McGraw Tower

Cornell University buildings viewed from McGraw Tower

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Cornell, Columbia and Brown received bomb threats Sunday afternoon.

Students at the schools described a panicked scene when the universities alerted them.

Jesse Kay, a student at Cornell, told Fox News he was at a Starbucks near campus when he got an alert about a bomb threat.

 

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"There was a bunch of confusion for a solid hour or so on whether there was an active shooter or a bomb threat. So there was a lot of chaos," Kay said. "I was grabbing Starbucks, and they said they were locking it down."

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Kay said many people were running away from campus.

"After [Starbucks] said they were locking the doors up, a fair amount of people headed out back home, and then outside there was a ton of people running into Collegetown from campus," he said.

The main campus of Columbia University in New York on a warm, sunny fall day.

The main campus of Columbia University in New York on a warm, sunny fall day.

Another Cornell student said he was studying in one of the buildings that was evacuated when he got the alert and left.

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Columbia University tweeted that an investigation by the New York Police Department determined that the bomb threats were not credible.

One Twitter account was reportedly suspended after making multiple threats to Columbia University. Fox News has reached out to Twitter.