Obama tells gay community after Orlando attack: 'You are not alone'

US President Barack Obama on Tuesday voiced solidarity with the LGBT community after the deadly mass shooting at a gay nightclub in Orlando, calling the gunman an "angry, disturbed, unstable young man who became radicalized."

"You are not alone. The American people and our allies and friends all over the world stand with you," Obama said after a meeting of his National Security Council, called before the Orlando attack to discuss the US-led campaign against the Islamic State group in Iraq and Syria.

The IS group claimed responsibility for the shooting in Orlando early Sunday. The gunman, Omar Mateen, pledged allegiance to the IS leader in 911 calls made during the attack, the FBI said.