FORT LAUDERDALE, Fla. — A day before the suspect in the Fort Lauderdale airport rampage was to appear in court, a website released footage that appears to show him calmly drawing a pistol and opening fire in the baggage claim area.

The video recording posted on TMZ’s websitehttp://www.tmz.com/2017/01/08/ft-lauderdale-shooting-first-shots-video/ appears to show Esteban Santiago walking through baggage claim of the Fort Lauderdale-Hollywood International Airport on Friday, pulling a handgun from his waistband and then firing several times before running.

Santiago, 26, is accused of killing five travelers and wounding six others in the attack. He was charged Saturday with an act of violence at an international airport resulting in death — which carries a maximum punishment of execution — and weapons charges. His first court hearing is Monday.

The FBI said in an email that it was aware of the video but would not comment on its authenticity. TMZ does not say where it obtained the video, although it appears to be from a surveillance camera.

Santiago told investigators that he planned the attack, buying a one-way ticket to the Fort Lauderdale airport, a federal complaint said. Authorities don’t know why he chose his target and have not ruled out terrorism.

Authorities said Saturday during a news conference that they had interviewed roughly 175 people, including a lengthy interrogation with a cooperative Santiago, who is a former National Guard soldier from Alaska.

FBI Agent George Piro said Santiago spoke to investigators for several hours after he opened fire with a 9mm semi-automatic handgun that he appears to have legally checked on a flight from Alaska.

“Indications are that he came here to carry out this horrific attack,” Piro said. “We have not identified any triggers that would have caused this attack. We’re pursuing all angles on what prompted him to carry out this horrific attack.”