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Stephen Craig Paddock, the shooter who killed more than 50 and injured more than 500 when he opened fire on concert-goers in Las Vegas Sunday night, was almost completely unknown to authorities before last night.

Paddock, a 64-year-old white male, started spraying bullets around 10pm from the 32nd floor of the Mandalay Bay Resort and Casino near the Route 91 Harvest music festival. He had been checked in to the hotel since Thursday.

The shooter died from apparently taking his own life before a police SWAT team broke down his hotel room door.

The resident of a retirement community in Mesquite, Nevada, a small town around 80 miles north of Las Vegas, had stashed his room with at least 10 rifles, police reported. His home contained additional weapons and ammunition.

Mesquite authorities said they had no previous contact with Paddock.

"What's unique for us is the gunman, the shooter, and the person with him, we in the Mesquite Police Department have not had any contact with these people in the past. We haven't had any traffic stops, any law enforcement contact, no arrests or nothing," Mesquite police spokesman Quinn Averett said.

Las Vegas Metropolitan Police Sheriff Joseph Lombardo said they had "no knowledge of this individual."

Police have not revealed anything about his motive for the massacre and have declared it a terrorist attack.

"We have no idea what his belief system was," Sheriff Joseph Lombardo said. "Right now, we believe he was the sole aggressor and the scene is static."

Stephen and his brother Eric spoke to their mother on the phone only about a week ago. The shooter's brother said he was "completely dumbfounded.”

“We can’t understand what happened,” he continued, saying his brother was "just a guy" who retired to Nevada for the gambling.

The gunman owned two planes and had a private pilot's license. He worked from 1985 until 1988 for a yet unidentified predecessor company of Lockheed Martin, the world’s largest defense contractor, which said in a statement they are working with authorities to gather information about him.

The shooter's live-in companion, Marilou Danley, was in the Philippines at the time of the incident, but police do not suspect her to be involved. Her identification was used by Paddock, authorities said.

Paddock's father lived a rather impressive life of crime. Benjamin Hoskins Paddock was on the FBI’s Top Ten Most Wanted list from 1969 to 1977. Nicknamed “Big Daddy” and “Old Baldy," he robbed a number of banks and broke out of jail in Texas before trying to make it as a manager of an Oregon bingo parlor.

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