Officials Look Into Background of Suspected Fort Lauderdale Airport Shooter

ABC News' Brian Ross reports on the latest news about Esteban Santiago.
2:22 | 01/07/17

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Transcript for Officials Look Into Background of Suspected Fort Lauderdale Airport Shooter
Incredible what he did. Speaking of Santiago, investigators are digging deeply into his background. His name, Esteban Santiago. Good morning, Dan and Paula. Santiago remains a mystery but what is emerging is a profile of a bad soldier with mental problems who was out on bail facing charges of beating up his girlfriend and claimed there were voices in his head forcing him to join ISIS. It's still far from clear what led this 26-year-old veteran to go on his murderous rampage but some of his social media accounts are raising concerns. His Instagram profile page has photos of him in uniform as a member of the army national Guard in Puerto Rico and then Alaska. He was deployed to Iraq for a year and was discharged four months ago for unsatisfactory performance. Santiago's profile statement reads here's to finding whether or not your mission on Earth is finished. If your still alive, it isn't. Federal authorities tell ABC news that Santiago recently received mental health treatment after he showed up at the Anchorage, Alaska, FBI office claiming the government was forcing him to watch ISIS videos. Agents described him as incoherent. His erratic behavior concerned FBI agents that were interviewing him. He was taken into custody by the local police and transported to a medical facility for a mental health evaluation. Reporter: Shortly after the attack FBI agents and police quickly showed up at one of Santiago's last known addresses at this trailer park in Anchorage and outside the home of his relatives in union city, New Jersey, trying to decipher his troubled life and what brought him to the airport in ft. Lauderdale with a gun. Authorities tell ABC news the FBI agents in Alaska actually opened up what is known as a guardian case on Santiago which is done when there is a suspicion of possible terrorism. But because he was not deemed a threat only to himself but to others agents did not put him on a no-fly list or have him designated as raising a flag if he booked a plight. They will be looking back at those decisions now, I suspect. They will. Shootings raising questions

This transcript has been automatically generated and may not be 100% accurate.

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