Orlando, June 12: United States President Barack Obama today addressed his nation after a gunman killed 50 people and injured 53 at a gay nightclub in Orlando, Florida on Sunday. Today’s mass shooting is the biggest terror attack on US homeland since 9/11. Obama who was briefed about the situation minutes after Orlando was kept on high alert said, “This was an act of terror and act of hate”.Also Read - Nightclub shooting victims sue gunman's employer, wife

While expressing his condolence to the family members and friends of victims, Obama said, “We stand with the people of Orlando.Though early to say but we know enough to say that this was act of terror and hate”. Also Read - Barack Obama Final Speech: Outgoing US President wishes for a Hindu President in Final News Conference before his goodbye! (Watch video)

The 29-year-old gunman who was killed during the operation carried out by Orlando police officials has been identified as Omar Saddiqui Mateen, according to law enforcement agencies. Read Also: (Florida Pulse Club shooting: Omar Mateen identified as Orlando nightclub offender) Also Read - US President Barack Obama mocked Donald Trump on his Twitter privileges being revoked

Mateen’s parents hail from Afghanistan while he was a United States citizen. His family has been located to US for quite a long time. Reports suggest that the gunman who acted as a lone wolf had earlier called 911, where he pledged allegiance to ISIS and mentioned the Boston bombers. Since then he was on radar of security officials, but was not targeted for investigation.

An investigation conducted by police officials showed that Mateen was working as a Florida security officer and had a state firearms license, TMZ said in a report. Authorities suggest that Mateen had targeted gays. The officials said in addition to terrorism this is a hate crime.

The Orlando police officials along with the Federal Bureau of Investigation believe Mateen was a part of radical Islamic movement. Orlando Mayor Buddy Dyer today declared a state of emergency and requested Florida governor Rick Scott to do the same.

Watch Barack Obama addressing media after Florida mass shooting: