Questions loom about motive behind Las Vegas mass shooting

'It doesn't make any sense that he killed those people,' brother says

ORLANDO, Fla. – More than 24 hours into the investigation into why Stephen Paddock opened fire on thousands of people Sunday night in Las Vegas, authorities continue to discover more information about the 64-year-old.

"An excess of 18 additional firearms, some explosives and several thousand rounds of ammo, along with electronic devices we're evaluating at this point," Clark County Sheriff Joseph Lombardo said at a news conference. 

Those weapons were all found in Paddock's Mesquite, Nevada, home, in addition to the more than 20 weapons found in the Mandalay Bay hotel room, where Paddock was found dead.

Windows were also found smashed in the hotel room, giving him a perfect vantage point over the concert venue, where 59 people were killed and more than 500 others were injured, authorities said.

"It doesn't make any sense that he killed those people. It makes no sense that he did that," the gunman's brother, Eric Paddock, said. 

Eric Paddock lives in Orlando and has been dumbfounded ever since he got the news.

He said his brother was a multi-millionaire former accountant, an avid gambler and someone who never resorted to violence.

“There are no words to describe the sadness we feel for those who lost their lives in this tragic event," reads a statement from the Paddock family. "Please know that you are in our prayers and that our hearts are heavy for the families who have been left heartbroken and without answers. Like everyone, we are learning the details about what happened as they come out. There is just no way to express our shock, devastation and sorrow for all the victims, and their families' unimaginable loss.”

Authorities said they found Stephen Paddock's girlfriend, Marilou Danley, outside of the country, and investigators, as well as his family, are hoping she can help piece together why this happened.

"They're going to autopsy him I hope, real carefully, and find out, because Steve doesn't do this," Eric Paddock said. 

Records show that Stephen and Eric Paddock's father was a bank robber who was once on the FBI's most wanted list, but Eric Paddock said they barely knew their father, and he doesn't think his brother was trying to gain similar notoriety.

He said his family is now hoping someone can find out the reason why his brother would commit a mass shooting, because they still cannot wrap their heads around why this happened.

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