In L.A., after reports of a gunman came from multiple terminals, all flight operations at the airport were halted for 30 minutes. Airlines reported just two flights canceled.
On its official Twitter account, LAX posted that a man dressed as Zorro was arrested after people had reported he had a sword.
CNN's Paul Vercammen, reporting from the airport, said the man was involved in cosplay, or costume play.
As airport police checked Terminal 8, there were reports of gunfire in other areas, Maggard said.
The shooting scare on Sunday night, which marked the worst security disruption in almost three years at the second-busiest US airport, began with police receiving a call reporting gunshots fired at a United Airlines gate inside Terminal 8, police said.
The Los Angeles Police Department evacuated the airport and conducted a search, later confirming there was no evidence of any shooting and that the incident appeared to be a false alarm. Many passengers and employees evacuated onto the airfield and into the Central Terminal Area roadways.
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Throughout the event, the public and passengers were kept informed of developments, and a new wireless emergency alert system passed information to cell phone customers within five miles of the airport, Maggard said.
Passengers ran through the terminals and on the tarmac at about 8:45 p.m.
An LAX evacuation sparked by "loud noises" at Los Angeles International Airport on Sunday night proved to be a false alarm, but not before sending one of the nation's largest airports into panic mode.
The Federal Aviation Administration instituted a ground stop for flights departing for LAX from airports west of and including Minnesota during the incident.and then later changed the ground top to only include flights departing to LAX within a one-hour flight time. "There was so much chaos you couldn't tell if people were falling down because they were shot". Twelve of those flights were diverted to Ontario International Airport. No shots fired; no injuries. Three terminals and nearby roads were temporarily closed, and many passengers had to go through security screening again, according to the AP. Police went floor to floor to clear the airport and ensure there was nothing to be found, a source said.
McClain told the station some people inside the airport heard loud noises they knew weren't gunshots but said it was possible the noises induced some other people to call 911. Reports of an active shooter triggered panicked evacuations. What happened was somebody called and said there's a man in dark clothing out here.
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