What we know about the Fort Lauderdale airport shooting suspect

 The man suspected of killing five people Friday at Fort Lauderdale's airport has been identified as Esteban Santiago, according to US Sen. Bill Nelson and multiple law enforcement officials.

Santiago has not been charged. Here is what we know about the suspected shooter:

• Santiago flew into Florida on a flight from Alaska and had declared his handgun in a firearms carrying case, law enforcement sources told CNN.

• Upon arriving at Fort Lauderdale-Hollywood International Airport, he picked up the carrying case at baggage claim, took out the gun and started firing, according to law enforcement sources.

• One source said Santiago went to the bathroom to get the gun out of the case and emerged shooting.

• The gunman likely acted alone, Broward County Sheriff Scott Israel said.

• Santiago had purchased two handguns -- a 9 mm Glock and a Glock .40-caliber -- in the past, according to a law enforcement source with knowledge of the investigation. It is unknown whether either of these pistols were used in Friday's attack.

• Santiago's criminal record in Alaska includes three minor charges, such as having no proof of insurance in 2015 and a tail light violation in 2015.

 People stand on the tarmac at Fort Lauderdale-Hollywood International Airport after an apparent lone shooter opened fire inside Terminal 2 on Friday, January 6. Five people were killed and eight others were wounded, officials said. 

• He served in the Puerto Rico National Guard and the Alaska Army National Guard.

• He joined the Puerto Rico National Guard on Decenber 14, 2007, said Lt. Col. Candis
 Olmstead of the Alaska Army National Guard.

• Santiago was deployed to Iraq with the Puerto Rico National Guard from April 23, 2010,
 to February, 19, 2011, said Olmstead. 

• Santiago received the Iraq Campaign Medal with a campaign star, a combat-related honor,
 CNN's Barbara Starr reported. 

• He served in the US Army Reserve before joining the Alaska Army National Guard on
 November 21, 2014, Olmstead told CNN.

• Santiago was later given a general discharge from the Alaska Army National Guard on 
August 16, 2016 for unsatisfactory performance.

• Santiago was not on the radar for possible terrorism ties, according to a law enforcement 
official and a Department of Homeland Security official.

• Santiago had no significant foreign travel that was ever flagged, another official said. 

• He visited the FBI's Anchorage, Alaska, office a few months ago and told them an 
intelligence agency was telling him to watch ISIS videos, according to law enforcement 
officials.

• The officials said Santiago's associates were concerned because he said he was hearing 
voices; they had accompanied him to the FBI office in Anchorage.

• The FBI looked into Santiago's background and saw his military history but found no 
information to indicate radicalization, officials said. The FBI asked local police to take him
 to the hospital for a mental health evaluation. Santiago voluntarily checked himself in.

• Santiago lived in Alaska and was employed by an Anchorage security company, a law 
enforcement official said. 

Source CNN