Investigators are trying to determine whether anyone else was in the Las Vegas gunman’s hotel room during the time he was registered there.
And the team have come up with two shocking discoveries that suggest the 64-year-old gunman may have had an accomplice.
First, a charger was found in his Mandalay Bay hotel room on the 32nd floor overlooking the Las Vegas strip that does not match any of the cellphones that belonged to the gunman.
Secondly, garage records show that during a period when Paddock’s car was left the hotel garage, one of his key cards was used to get into his room.
Detectives say there are several possible explanations for the anomalies, but officers want to get to the bottom of it as soon as possible.
Paddock unleashed a deadly barrage of bullets from the 32nd floor of the Mandalay Bay Hotel and Casino on Sunday night, killing at least 59 people and injuring about 500 others who were attending the Route 91 country music festival below.
It is feared Paddock could have spent more than 20 years plotting his devastating attack on innocent people in Las Vegas.
And officials also believe Paddock may not have acted alone.
Sheriff Joseph Lombardo said: “At face value, he had to have some help at some point and we want to ensure that that’s the answer
“Maybe he was a superhuman who figured this out all on his own but it would be hard for me to believe that.”
The professional gambler fitted 12 of his weapons with so-called bump-stock devices that allow semi-automatic rifles to operate as if they were fully automatic machine guns, which are otherwise outlawed in the United States.
And authorities said his ability to fire hundreds of rounds per minute for 10 minutes from a 32nd-floor hotel suite was a major factor in the high casualty count.
His motive is still unclear and although Islamic States (ISIS), had claimed the attack, the FBI said there was no indication he wa slinked to any extremist groups.
Senior law enforcement officials said Paddock, 64, had researched possible attack locations in Boston and Chicago, including the Lollapalooza festival in Chicago in August.
A retired truck driver from Arizona, a single mother, a youth wrestling coach from Pennsylvania and a commercial fisherman from Alaska were among the victims of the Sunday night attack.
Thousands of mourners turned out on Thursday for a candlelight vigil honouring a Las Vegas police officer and member of the Nevada National Guard who was among those slain at Sunday’s concert while he was there off duty.
Under a full moon in a grassy memorial park, a police honour guard including bagpipes paid tribute to Charleston Hartfield, 34, who is survived by his wife and two children.
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