Omar Mateen, the man suspected of taking 50 lives in an Orlando gay club, is believed to have sworn allegiance to ISIS, US Congressman Adam Schiff.fightCiting local law enforcement, Schiff said: “The fact that this shooting took place during Ramadan and that ISIS leadership in Raqqa has been urging attacks during this time, that the target was an LGBT night club during Pride, and – if accurate – that according to local law enforcement the shooter declared his allegiance to ISIS, indicates an ISIS-inspired act of terrorism,”

The death toll makes the attack the deadliest mass shooting in US history, eclipsing the 2007 Virginia Tech massacre which left 32 people dead. Florida Governor Rick Scott told reporters the attack was “clearly an act of terrorism,” adding: “It is sickening, this should make every American angry.”

The gunman, who is among the dead, has been named as 29-year-old Omar Mateen of Port St. Lucie Florida, a US citizen of Afghan descent.