US President Barack Obama has described Sunday morning's homosexual nightclub shooting in Orlando, Florida, as "an act of terror and an act of hate".
Omar Mateen who is 29 years of age, killed 50 people and wounded 53 at the Pulse club before being shot dead by police.
The Islamic State group has said it was behind the attack.
It is also reported that Mateen had called the emergency services before the attack and swore allegiance to IS.
The attack is the worst mass shooting in recent US history.