UPDATE 2:51 p.m. EST:
TMZ posted video it claims shows the first few seconds of the Friday shooting in Fort Lauderdale-Hollywood International Airport.
In the video, a man walks through the baggage claim area, then pulls a handgun, starts shooting and runs. TMZ did not say where it found the video, though it appears to be from a security camera.
UPDATE 8:38 a.m. EST 1/8:
Esteban Santiago, accused of killing five people in Fort Lauderdale-Hollywood International Airport on Friday, used a gun that police had previously seized in his deadly attack, CNN reports.
Santiago, at one point, left the gun and his newborn child in a car while he was at an FBI office in Alaska. He reportedly told officials that ISIS was controlling his mind. His gun was taken away, but he wasn't banned from owning one. He got the gun back a month later..
You know we have this situation where he slipped through the cracks.
Investigators believe Santiago had planned the attack for some time. He had started selling his possessions before the shooting occurred. His time serving in the Army in Iraq changed chim, his aunt told CNN.
"He talked about all the destruction and the killing of children," Maria Ruiz Rivera said.
WATCH | FBI officials said Santiago broke no laws during a visit when he came to the office, but did make comments about mind control. Officials also insisted Santiago worked alone.
ORIGINAL STORY: Federal prosecutors have filed charges against the Florida airport shooting suspect that could bring the death penalty if he is convicted.
A criminal complaint filed Saturday by the Miami U.S. attorney's office accuses 26-year-old Esteban Santiago of an act of violence at an international airport resulting in death. The punishment is execution or any prison sentence up to life.
Prosecutors also charged Santiago with two firearms offenses.
Santiago is accused of fatally shooting five people and wounding six others Friday at a Fort Lauderdale-Hollywood International Airport baggage claim. The FBI says Santiago traveled from Alaska to Fort Lauderdale specifically to carry out the shooting.
Santiago, an Iraq war veteran, is being held without bail. He is scheduled to make his first court appearance Monday.
(The Associated Press contributed to this report)