Las Vegas shooting: Gunman fired for 9 to 11 minutes

It took about 10 minutes of gunfire for Stephen Paddock to carry out the deadliest mass shooting in which 59 were killed and more than 500 people wounded from gunshots to stampede injuries.

Stephen Paddock, the Nevada man whom authorities identified as the gunman who killed 59 people on Sunday night, "continued to fire at a progressive successive rate for approximately nine minutes" after authorities received a 911 call, Clark County Sheriff Joseph Lombardo said.

Investigators found that Paddock meticulously planned the shooting. He checked into a hotel room overlooking the music festival, stocked a cache of weapons there and set up cameras inside his hotel suite and hallway.

The shots started at 10:08 p.m. and the gunfire stopped at 10:19 p.m., the shooting went off and on for nine to 11 minutes, CNN quoted Clark County Undersheriff Kevin McMahill as saying.

Authorities say the gunman put a camera in a food service cart outside his hotel room. Sheriff Lombardo, said at a news conference Tuesday, that he believes Paddock had set up cameras inside and outside his room to see if anyone was coming to take him into custody. He did not release further details.

Investigators probing the Las Vegas massacre have searched Paddock's home and recovered 42 firearms, an assortment of explosives and several thousand rounds of ammunition from his Las Vegas hotel room and his Mesquite home.

Investigators believe that Paddock used bump-stock for the attack as it modifies a semi-automatic weapon to fire at an automatic rate. Bump-stock is a legal device that enables a shooter to fire bullets rapidly, similar to an automatic rifle. Paddock had outfitted 12 of his firearms with the bump stocks, according to the Bureau of Alcohol, Tobacco, Firearms and Explosives.