Authorities have identified Esteban Santiago as the suspected gunman in the shooting Friday afternoon at Florida's Fort Lauderdale-Hollywood International Airport, which killed at least five people and injured eight others.
Santiago, a 26-year-old born in New Jersey, is believed to have acted alone. Law enforcement said Santiago was a passenger on a flight from Canada and had the weapon in his checked bag; he allegedly began firing after picking up his gun at baggage claim. However, Air Canada said on Twitter that there is no record of a passenger by that name aboard any flights to Fort Lauderdale and that no weapons were checked.
A military ID was found on Santiago when he was taken into custody, though it was not immediately clear if the ID belonged to him.
Family sources said Santiago had some mental health issues while Santiago's brother said he had "received psychological treatment in Alaska" and that he served in the National Guard.
The man, who was wearing a Star Wars T-shirt, had travelled from Alaska and checked in an unloaded gun and ammunition with his luggage. He loaded the weapon in the bathroom after landing and collecting his bag.
Flying with firearms is legal in the US as long as the guns are kept in a locked, hard-sided container as checked baggage only, under rules of the Transport Security Administration (TSA). Ammunition is allowed only in checked luggage.