Law enforcement officials identified the shooting suspect who opened fire at Los Angeles International Airport on Friday as 23-year-old Paul Ciancia, The Associated Press, NBC News and CBS News reported.
The gunman is believed to be the "lone shooter" in the incident, Los Angeles Airport Police Chief Patrick Gannon said.
"We believe this to be a static situation now, a safe one for all who are in the airport," Los Angeles Mayor Eric Garcetti said during a news conference.
Two TSA agents were shot Friday at Los Angeles International Airport -- one who died, and another who was shot in the leg -- a former Los Angeles Police Department ranking officer said, citing discussions the former officer had with investigators. The gunman had multiple magazines for his weapon, the source said.
The shooter "pulled an assault rifle out of a bag and began to open fire in" Terminal 3 on Friday morning, Gannon told reporters.
Ronald Reagan UCLA Medical Center said it received three male victims from Los Angeles International Airport, where shootings occurred Friday.
Both The Associated Press and Washington Post reported on Friday afternoon that two other people besides the agent killed had been wounded. The Wall Street Journal reported that "several" TSA officers were injured.
Almost every flight out of Los Angeles International Airport on Friday will be "significantly late," according to Gina Marie Lindsay, executive director of Los Angeles World Airports. The airport is still accepting incoming flights, but doing so at less than half the normal rate, she said.
The gunfire and the airport's announcement of the incident provoked chaos among travelers on a busy morning, passengers said.
One of the busiest airports in the world was rendered a ghost town: The violence prompted evacuations of portions of LAX and led to a "ground stop" for arriving planes, said police and the Federal Aviation Administration.
Robert Perez, who was getting ready to take a Virgin Air flight, was taking a nap in the terminal when pandemonium erupted, he told CNN affiliate KCAL/KCBS.
"I heard a popping sound, and everybody was diving for cover," Perez told the station. "The TSA said there was a shooting in the terminal and evacuate the building."
At least 100 people came down a staircase. "Everybody started to panic," Perez said.
Fox Sports national columnist Bill Reiter was also at the airport during the gunfire. "After the initial burst of gunfire and hiding, people started jumping over one another, jumping off chairs, pushing each other. Chaos & fear," he said on his Twitter account.
The passengers were directed to board a bus and were taken to a smaller terminal, Perez told the affiliate.
Alex Neumann was at a food court, waiting to travel to Miami, when the incident unfolded. He said Terminal 2 was put into lockdown.
"People were running and people getting knocked down. There was luggage everywhere," Neumann said. "Mayhem is the best I can describe it."
Several police officers moved about the airport with guns drawn, he said. KCAL showed live video of three officers with rifles to their shoulders inspecting parked cars in an open-air parking lot.
The Los Angeles Fire Department was assisting with a "multi-patient" incident at Los Angeles International Airport, the department said Friday on Twitter.
Firefighters were laying tarps on the street at the airport, apparently for triage. Several ambulances were at the airport, and at least one person was loaded into one.
The area around the airport was jammed with cars as police shut down access to the airport Friday morning.
President Barack Obama has been briefed on the shooting and will continue to be updated, but the White House had no further information at this time on what happened, spokesman Jay Carney said Friday.
Authorities were interviewing about 100 witness, the intelligence source said.