The man suspected of carrying out a deadly shooting at a Florida airport has been charged by prosecutors.
Esteban Santiago, 26, is accused of opening fire on passengers at Fort Lauderdale airport , killing five people and injuring others.
He is charged with carrying out an act of violence at an international airport resulting in death, which carries a maximum punishment of execution.
He also faces lesser weapons charges.
"Today's charges represent the gravity of the situation and reflect the commitment of federal, state and local law enforcement personnel to continually protect the community and prosecute those who target our residents and visitors," US Attorney Wifredo Ferrer said.
Officials are looking whether mental health problems played a role after it emerged that the suspect had been referred for a health assessment by the FBI.
The suspect had walked into an FBI office in Alaska in November, agitated and incoherent, the FBI and Anchorage police said.
He was carrying a loaded magazine but had left his handgun in his car, with his newborn child.
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Media captionFBI's George Piro said terrorism had not been ruled out During the later mental health evaluation, he told the FBI he was hearing voices and believed he was being controlled by a US intelligence agency.
His gun was confiscated but the authorities found no wrongdoing, and it was returned in December.
Karen Loeffler, the US attorney for Alaska, told journalists: "As far as I know this is not a person that would have been prohibited from having a gun."
She explained that federal law only allows for gun rights to be taken away from someone on mental health grounds if they are "adjudicated mentally ill".
Image copyright AP Image caption Passengers ran for cover as news of the shooting spread FBI agent George Piro said earlier that the suspect had travelled to Fort Lauderdale specifically to carry out the attack.
There was no sign of any altercation on the flight or at the airport before the attack began, Mr Piro said.
Mr Piro said: "We continue to look at all avenues and all motives for this horrific attack. We are continuing to look at the terrorism angle in regards to the potential motivation."
Mr Santiago is a former member of the Puerto Rico and Alaska National Guard, according to the Pentagon.
He served in Iraq from April 2010 to February 2011, and ended his service in August 2016.
US media reported that he had received a general discharge from the Alaska National Guard for unsatisfactory performance.
His brother said he had been receiving psychological treatment recently.
His aunt told a local newspaper he had "lost his mind" while serving in Iraq.
Victims named
One of the victims was Georgia resident Olga Woltering, originally from Ipswich in eastern England.
A devout Catholic in her 80s, she was named as a victim by her Atlanta church, the Catholic Church of the Transfiguration. It described her as a "joyful, loving, caring and committed" person.
"This is a horrible tragedy for everyone here at Transfiguration, especially because Olga was so loved," it said.
Ms Woltering, from Marietta near Atlanta, was in Florida on her way to join a cruise to celebrate her husband's 90th birthday. He was unharmed in the shooting.
Another victim, 57-year-old Iowa man Michael Oehme, was named by his sister, Elizabeth Oehme-Miller.
A third victim was named as Terry Andres, 63, a volunteer fireman from Virginia Beach, Virginia.
Image copyright Getty Images Image caption The suspect was quickly taken into custody Fort Lauderdale Airport reopened on Saturday but Terminal 2, where the shootings happened, remains closed.
Airport officials say they still have 20,000 items of luggage to return to their owners.
A tweet from the airport account said this was a "complex and time-consuming process". When the gunman opened fire, many people rushed out on to the tarmac.
Flying with firearms is legal in the US as long as the guns are kept in a locked, hard-sided container as checked baggage only, under rules of the Transport Security Administration (TSA). Ammunition is also allowed only in checked luggage.
The attack was the latest in a series of mass shootings in the US in recent years, carried out by people who had easy access to weapons under US gun laws.
Last year, in the worst shooting in recent US history, a man apparently inspired by so-called Islamic State killed 49 people at a gay nightclub in Orlando, Florida.
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Esteban Santiago, 26, is accused of opening fire on passengers at Fort Lauderdale airport , killing five people and injuring others.
He is charged with carrying out an act of violence at an international airport resulting in death, which carries a maximum punishment of execution.
He also faces lesser weapons charges.
"Today's charges represent the gravity of the situation and reflect the commitment of federal, state and local law enforcement personnel to continually protect the community and prosecute those who target our residents and visitors," US Attorney Wifredo Ferrer said.
Officials are looking whether mental health problems played a role after it emerged that the suspect had been referred for a health assessment by the FBI.
The suspect had walked into an FBI office in Alaska in November, agitated and incoherent, the FBI and Anchorage police said.
He was carrying a loaded magazine but had left his handgun in his car, with his newborn child.
Jump media player
Media player help
Out of media player. Press enter to return or tab to continue.
Media captionFBI's George Piro said terrorism had not been ruled out During the later mental health evaluation, he told the FBI he was hearing voices and believed he was being controlled by a US intelligence agency.
His gun was confiscated but the authorities found no wrongdoing, and it was returned in December.
Karen Loeffler, the US attorney for Alaska, told journalists: "As far as I know this is not a person that would have been prohibited from having a gun."
She explained that federal law only allows for gun rights to be taken away from someone on mental health grounds if they are "adjudicated mentally ill".
Image copyright AP Image caption Passengers ran for cover as news of the shooting spread FBI agent George Piro said earlier that the suspect had travelled to Fort Lauderdale specifically to carry out the attack.
There was no sign of any altercation on the flight or at the airport before the attack began, Mr Piro said.
Mr Piro said: "We continue to look at all avenues and all motives for this horrific attack. We are continuing to look at the terrorism angle in regards to the potential motivation."
Mr Santiago is a former member of the Puerto Rico and Alaska National Guard, according to the Pentagon.
He served in Iraq from April 2010 to February 2011, and ended his service in August 2016.
US media reported that he had received a general discharge from the Alaska National Guard for unsatisfactory performance.
His brother said he had been receiving psychological treatment recently.
His aunt told a local newspaper he had "lost his mind" while serving in Iraq.
Victims named
One of the victims was Georgia resident Olga Woltering, originally from Ipswich in eastern England.
A devout Catholic in her 80s, she was named as a victim by her Atlanta church, the Catholic Church of the Transfiguration. It described her as a "joyful, loving, caring and committed" person.
"This is a horrible tragedy for everyone here at Transfiguration, especially because Olga was so loved," it said.
Ms Woltering, from Marietta near Atlanta, was in Florida on her way to join a cruise to celebrate her husband's 90th birthday. He was unharmed in the shooting.
Another victim, 57-year-old Iowa man Michael Oehme, was named by his sister, Elizabeth Oehme-Miller.
A third victim was named as Terry Andres, 63, a volunteer fireman from Virginia Beach, Virginia.
Image copyright Getty Images Image caption The suspect was quickly taken into custody Fort Lauderdale Airport reopened on Saturday but Terminal 2, where the shootings happened, remains closed.
Airport officials say they still have 20,000 items of luggage to return to their owners.
A tweet from the airport account said this was a "complex and time-consuming process". When the gunman opened fire, many people rushed out on to the tarmac.
Flying with firearms is legal in the US as long as the guns are kept in a locked, hard-sided container as checked baggage only, under rules of the Transport Security Administration (TSA). Ammunition is also allowed only in checked luggage.
The attack was the latest in a series of mass shootings in the US in recent years, carried out by people who had easy access to weapons under US gun laws.
Last year, in the worst shooting in recent US history, a man apparently inspired by so-called Islamic State killed 49 people at a gay nightclub in Orlando, Florida.
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