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Gunshots were reported at Los Angeles International Airport on Friday. Airport officials said shortly before 2 p.m. that a suspect was in custody and that there were multiple victims.

The airport said that there are “multiple victims,” and the Los Angeles Fire Department also reported a “multi-patient incident.” But it remained unclear how many people were injured.

The airport said that a “police incident” began at 9:30 a.m. local time in Terminal 3, which is home to Virgin America, Spirit, JetBlue and Frontier airlines.

A witness told the Associated Press that he heard “about a dozen gunshots.”

Bill Reiter, a columnist for Fox Sports, is at the airport and has been tweeting updates from the chaotic scene.

Reiter said that after he heard gunfire, there was a “stampede” of people running on the airport’s tarmac.

The Federal Aviation Administration has halted flights into the airport.

Videos taken at the airport show people, many holding luggage and checking their phones, gathered on the tarmac:

The Federal Aviation Administration requires that U.S. airports hold emergency exercises every three years to test how they will respond to a serious incident at an airport, including a plane crash or incident where there are a significant number of casualties.

The Los Angeles airport held its emergency drill in April.

Both Reagan National and Washington Dulles also held exercises this year. The incident in Los Angeles hasn’t affected flights into or out of either airport, said airport spokeswoman Kimberly Gibbs.

The Los Angeles Times posted this map showing where the gunfire was reported:

President Obama has been briefed on the incident by deputy White House chief of staff Alyssa Mastromonaco and will receive regular updates, White House press secretary Jay Carney told reporters.

Carney said the Los Angeles Police Department is taking the lead right now, but added that “we’re obviously, at the federal level, in touch with law enforcement officials on the ground and the president will be updated as the afternoon progresses.”

This post has been updated.

Lori Aratani, Philip Rucker and T.J. Ortenzi contributed to this post.