Shooting In Las Vegas: Heartbreaking Photos Of Massacre [GRAPHIC CONTENT]

Stephen Craig Paddock, 64, of Mesquite, Nevada, opened fire using long range rifles from the 32nd floor of his hotel room at the Mandalay Bay Casino in Las Vegas at a crowd that was enjoying the three-day Route 91 Harvest Festival.

So far, authorities have reported 58 fatal victims and more than 500 injured. Among the dead were identified at least three police officers from various departments who were attending the concert.

Sheriff Joseph Lombardo informed Paddock was found dead in his room when a police SWAT team broke down the door. Authorities believe Paddock killed himself. According to the local police, he had been living in a retiree community 80 miles northeast of Las Vegas.

Authorities believed this was a "lone wolf" attack, while the U.S. Homeland Security Department said there was no "specific credible threat" involving other public venues in the U.S.

Sheriff Lombardo wasn't sure if this was an act of terrorism, however, according to ISIS, the attacker is an "Islamic State soldier" converted to Islam a few months ago. The jihadist organization has assured that the assailant responded to his call to attack the member countries of the international coalition that fights against the Islamic State in Iraq and Syria.

Nevertheless, the FBI has dismissed the claims. Special Agent in Charge Aaron Rouse said at a news conference Monday that the shooter had no connection to an international terrorist group.

Below are pictures that show the scene of the massacre.