Watch: Las Vegas Metropolitan Police Department gives briefing on massacre

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LAS VEGAS – Officials with the Las Vegas Metropolitan Police Department are giving an updated briefing on Sunday night’s massacre that killed 59 people and left 527 people injured.

As of 10 p.m. ET Monday, Clark County Assistant Sheriff Todd Fasulo said police recovered 23 guns from the Las Vegas hotel room of mass shooter Stephen Paddock. Fasulo said another 19 guns were found at Paddock’s Mesquite, Nevada home.

Stephen Paddock, who sent bullets and terror down on thousands attending a Jason Aldean concert in Las Vegas, had an arsenal in his 32nd-floor hotel room and at his home 80 miles away, officials said.

In the hours after the retired accountant committed what is considered to be the deadliest mass shooting in modern US history, authorities rolled out frightening new details, including the discovery of scopes on rifles at the resort and explosives at his home.

But what they couldn’t explain is why the man who had never faced any notable criminal charges did it. There was no known motive late Monday. Police believe Paddock acted alone, which could make the motive harder to determine.

During the press conference Tuesday afternoon, Clark County Sheriff Joseph Lombardo said Paddock “continued to fire at a progressive successive rate for approximately nine minutes” after authorities received a 911 call.

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Full Coverage: Las Vegas Massacre