'Puzzling' discoveries fuel theories Las Vegas mass killer Stephen Paddock wasn't alone in Mandalay Bay hotel room
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Detectives probing the Las Vegas gun massacre have made two puzzling discoveries which suggest that the killer may not have been alone in his hotel suite.
Police haven't been able to rule out whether killer Stephen Paddock had visitors during his stay at the Mandalay Bay before launching the deadliest mass shooting in modern US history.
They've been left scratching their heads over two mysteries involving a mobile found charger and a hotel key card.
The charger doesn't match any of the phones belonging to the 64-year-old gunman, who checked into the hotel three days before Sunday night's rampage.
And hotel garage records show that one of his key cards was used to enter his suite after his car had left the garage for a period of time, sources have told NBC News.
(Image: @MikeTokes/Twitter)
(Image: @MikeTokes/Twitter)
Senior law enforcement officials said there were several possible explanations, without revealing further details.
There were also claims that Paddock had ordered several items from room service that would have been a large amount of food and drink for just one person.
A receipt purportedly from the killer's room listed two people under "guests".
(Image: Twitter)
The biggest mystery of all for detectives is why Paddock opened fire on a crowd of 22,000 people at a country music festival across from the hotel.
The motive for the massacre remains a mystery as police probe the killer's background and mental state.
It appears he left behind no note or manifesto which would offer an explanation or clues.
(Image: Getty)
His girlfriend, Marilou Danley, 62, was visiting family in the Philippines at the time and in a statement after being questioned by the FBI claimed she never had any inkling of his plans.
Paddock killed 58 people and injured more than 500 during about ten minutes of automatic gunfire, as he turned his 32nd floor suite into a sniper's perch.
Paddock had 23 firearms - including semi-automatic rifles modified with 'bump stocks' so they would fire like fully automatic machine guns - and shot at his victims through smashed windows.
Twelve of his guns were fitted with 'bump stocks' - allowing him to fire hundreds of rounds per minute - and there are now calls to ban them.
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The gunman - called "deranged" by US President Donald Trump - shot and killed himself after a hotel security guard located him.
He was dead by the time a police SWAT team blew open the door and found a scene of carnage, with guns and magazines scattered everywhere.
Paddock was a 'VIP' gambler and a wealthy retiree with real estate investments.
IRS records revealed that he earned at least $5million in 2015, most of it from gambling, NBC News reported.