The brother of a man accused of killing five people at a Florida airport has questioned why his brother was allowed to keep his gun after US authorities knew he'd become increasingly paranoid and was hearing voices.
Esteban Santiago, 26, had trouble controlling his anger after serving in Iraq and told his brother that he felt he was being chased and controlled by the CIA through secret online messages.
When he told agents at an FBI field office his paranoid thoughts in November, he was evaluated for four days, then released without any follow-up medication or therapy.
"The FBI failed there," Bryan Santiago said. "We're not talking about someone who emerged from anonymity to do something like this."
"The federal government already knew about this for months, they had been evaluating him for a while, but they didn't do anything."
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Bryan Santiago said he noted that his brother was behaving differently when he returned from Iraq.
"He sometimes couldn't control his anger," he said. "You could tell something had changed."
Bryan Santiago said that when he went to visit his brother in Alaska last August, Esteban told him he was hearing voices and felt he was being chased.
Authorities in Alaska on Saturday defended their interactions with Esteban Santiago.
FBI Special Agent in Charge Marlin Ritzman told a news conference that Santiago broke no laws when he walked into the Anchorage FBI office "making disjointed comments about mind control."
He characterised Santiago as a "walk-in complaint," which he said offices around the country receive daily.
Anchorage police were called to the office by the agency, told Santiago he was having "terroristic thoughts" and believed he was being influenced by Islamic State and was taken to a mental health facility, city Police Chief Chris Tolley said.
Santiago had left a gun in his vehicle when he went to the FBI office with his newborn child. Police held the gun until Santiago was released and contacted him about picking up the weapon, which he did on December 8, Tolley said.
Authorities would not confirm whether he used the same gun Friday. "There is speculation that it is the same gun. I have not received confirmation that it, in fact, is that gun," Tolley said.
Esteban Santiago was charged in a domestic violence case in January 2016, damaging a door when he forced his way into a bathroom at his girlfriend's Anchorage home.
Tolley detailed other complaints of physical disturbances last year involving Santiago but said officers found no probable cause for arrest.
Bryan Santiago said his brother had requested psychological help but barely received any.
"I told him to go to church or to seek professional help," he said.
Esteban Santiago's mother wiped tears from her eyes as she stood inside a screen door Saturday.
She said her son had been tremendously affected by seeing a bomb explode near two friends while serving in Iraq.
