ISIS claims responsibility for Florida gay club massacre: American-Afghan terrorist phoned 911 to pledge allegiance to group DURING attack before he was killed by cops

  • WARNING: GRAPHIC CONTENT 
  • US citizen Omar Mateen, 29, opened fire inside Pulse gay club in Orlando in the early hours of Sunday morning 
  • Mateen, from Port St. Lucie in Florida, killed at least 50 people, injured 53 and took about 100 party-goers hostage
  • Police used an explosive device to distract the gunman and rescued around 30 people who had been taken hostage
  • Officers engaged in gunfire with the man and an officer was shot in the head, but he was saved by his helmet
  • Mateen was eventually shot dead by officers shortly after 5am - three hours after the massacre began
  • Shooter had an associates degree in criminal justice and worked as a security guard with a company called G4S
  • Mateen was a 'known quantity' to the FBI and was investigated twice before the mass shooting
  • See more of the latest news on the Orlando shooting at Pulse gay club as gunman shoots at least 50 dead  

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Shooter Omar Mateen (pictured), 29, from Port St. Lucie in Florida, opened fire at Pulse night club in the early hours of Sunday
Shooter Omar Mateen (pictured), 29, from Port St. Lucie in Florida, opened fire at Pulse night club in the early hours of Sunday
ISIS has claimed responsibility for the the deadliest mass shooting in US history and says the gunman who slaughtered at least 50 innocent party-goers in an Orlando gay club was one of its fighters. 
Shooter Omar Mateen, 29, from Port St. Lucie in Florida, opened fire at Pulse night club in the early hours of Sunday, killing at least 50 people and injuring 53 others.
This is the first time ISIS has claimed responsibility for an attack on US soil. 
Shortly before the attack, Mateen, who was born in New York to Afghan parents, called 911 and pledged allegiance to ISIS leader Abu Bakr al-Baghdadi, law enforcement officials told NBC News
And the terror group's Amaq news agency said on Sunday the Islamist militant group was responsible for the shooting.
'The armed attack that targeted a gay night club in the city of Orlando in the American state of Florida which left over 100 people dead or injured was carried out by an Islamic State fighter,' Amaq said.
U.S. officials cautioned, however, that they had no immediate evidence of any direct connection with ISIS or any other foreign extremist group, nor had they uncovered any contacts between the gunman and any such group.
During the attack, Mateen referenced the brothers who carried out the 2013 Boston Marathon bombing, a Massachusetts State Police spokesman said on Sunday.
'During a conference call with federal law enforcement officials a short time ago, Massachusetts State Police and other local law enforcement authorities learned that the Orlando nightclub gunman, during his rampage, pledged allegiance to ISIS and referenced the Tsarnaev brothers,' state police spokesman David Procopio said in an e-mail.
The Tsarnaev brothers killed three people and injured more than 260 in the April 15, 2013, attack. Tamerlan Tsarnaev, 26, died four days later during a gun battle with police while Dzhokhar Tsaranev, now 22, has been sentenced to death for his role in the attack.   
However Mateen's father, Mir Seddique, told NBC News the attack was 'nothing to do with religion' and said his son became angry when he saw two men kissing in Miami several months ago.
'We are saying we are apologizing for the whole incident,' he said. 'We weren't aware of any action he is taking. We are in shock like the whole country.'
So far, only seven victims of the massacre have been officially identified by the city of Orlando on its website. 
They are: Edward Sotomayor Jr., 34; Stanley Almodovar III, 23; Luis Omar Ocasio-Capo, 20; Juan Ramon Guerrero, 22; Eric Ivan Ortiz-Rivera, 36; Peter O. Gonzalez-Cruz, 22; and Luis S. Vielma, 22.  
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Pictured: US citizen Omar Mateen, 29, from Port St. Lucie in Florida, slaughtered at least 50 people inside a gay club in Orlando
Omar Mateen
Pictured: US citizen Omar Mateen, 29, from Port St. Lucie in Florida, slaughtered at least 50 people inside a gay club in Orlando
Attack: A woman sits on the ground outside the club while another party-goer, whose legs are covered in blood, stands beside her
Attack: A woman sits on the ground outside the club while another party-goer, whose legs are covered in blood, stands beside her
A mini van pictured at the scene of the shooting has been confirmed as the vehicle used by Omar Mateen, 29, from Port St. Lucie in Florida
A mini van pictured at the scene of the shooting has been confirmed as the vehicle used by Omar Mateen, 29, from Port St. Lucie in Florida
Forensics pictured stanging outside at the nightclub after shooter Omar Mateen, 29, opened fire in the early hours of Sunday
Forensics pictured stanging outside at the nightclub after shooter Omar Mateen, 29, opened fire in the early hours of Sunday
Distressing: People wait outside the emergency entrance of the Orlando Regional Medical Center hospital after the shooting
A man reacts to the news of the shooting
Distressing: People wait outside the emergency entrance of the Orlando Regional Medical Center hospital after the shooting (left). Right: A man reacts to the tragic news
Investigators from the office of the medical examiner investigate the west side of Pulse nightclub where the gunman opened fire
Investigators from the office of the medical examiner investigate the west side of Pulse nightclub where the gunman opened fire
Distraught: A woman sits outside the nightclub following the mass shooting. Around 50 people were killed by the suspected gunman
Distraught: A woman sits outside the nightclub following the mass shooting. Around 50 people were killed by the suspected gunman
Friends and family members embrace outside the Orlando Police Headquarters during following the shooting at Pulse nightclub
Friends and family members embrace outside the Orlando Police Headquarters during following the shooting at Pulse nightclub
Ray Rivera, a DJ at Pulse Orlando nightclub, is consoled by a friend outside Orlando Police Department following the shooting
Ray Rivera, a DJ at Pulse Orlando nightclub, is consoled by a friend outside Orlando Police Department following the shooting
Demetrice Naulings  sobs outside the Orlando Police Headquarters where police are interviewing witnesses to the deadly attack
Demetrice Naulings sobs outside the Orlando Police Headquarters where police are interviewing witnesses to the deadly attack
Friends and family members embrace outside Orlando Police Headquarters following the deadly shooting in the early hours of Sunday
Friends and family members embrace outside Orlando Police Headquarters following the deadly shooting in the early hours of Sunday
SWAT: Orange County Sheriff's Department SWAT members arrive at the scene of the fatal shooting at Pulse Orlando nightclub in Orlando
SWAT: Orange County Sheriff's Department SWAT members arrive at the scene of the fatal shooting at Pulse Orlando nightclub in Orlando
Fatalities: At least 50 people were killed and 53 others were injured in the shooting. Pictured: An Orange County Sheriff's Department SWAT member
Fatalities: At least 50 people were killed and 53 others were injured in the shooting. Pictured: An Orange County Sheriff's Department SWAT member
An FBI spokesman said the mass shooting is being investigated as an act of terrorism
Pictured: Forensics at the scene of the attack
An FBI spokesman said the mass shooting is being investigated as an act of terrorism. Pictured: Forensics at the scene of the attack
Police, army and FBI surround the club after the gunman, wielding an assault rifle and a handgun, killed about 50 people
Police, army and FBI surround the club after the gunman, wielding an assault rifle and a handgun, killed about 50 people
Angel Mendez, standing outside the Orlando Regional Medical Center, holds up a cell phone displaying a photo of his brother Jean C. Mendez, who was at the Pulse nightclub. Angel is seeking information on his whereabouts
Angel Mendez, standing outside the Orlando Regional Medical Center, holds up a cell phone displaying a photo of his brother Jean C. Mendez, who was at the Pulse nightclub. Angel is seeking information on his whereabouts