The search warrants show investigators found three cell phones — one of which was locked — inside Stephen Paddock's Mandalay Bay hotel room.
Hundreds of pages of search warrant documents related to the deadly Las Vegas mass shooting were unsealed on Friday. The documents reveal that police investigators have not yet found a motive for the October 1 massacre that left 58 people dead and hundreds injured.
Gunman Stephen Paddock fired on concertgoers at the Route 91 Harvest country music festival from his 32nd-floor suite at the Mandalay Bay Resort & Casino. Police searched Paddock's room, his vehicle, and two homes he owned in Reno and in Mesquite, Nevada, where they found a cache of weapons.
Inside his hotel room, investigators found two unlocked cell phones. “Neither contained significant information that allowed investigators to determine the full scope of Stephen Paddock’s planning and preparation for the attack,” the documents said.
A third cell phone, which was locked, could not be accessed, according to the Los Angeles Times.
The newspaper also said investigators identified an email inbox belonging to Paddock that contained a message from a Gmail account officials believe was related to Paddock's preparations for the attack.
The message read in part: “for a thrill try out bumpfire ar’s with 100 round magazine,” an apparent reference to the "bump stock" device police say that Paddock affixed to a number of the firearms found in his room.
Investigators have interviewed Paddock's girlfriend, Marilou Danley, several times in the ongoing investigation, the court documents show.
Danley has not been named a suspect or charged with a crime, but investigators identified her as "the most likely person who aided or abetted" Paddock because she told police that "her fingerprints would likely be found on the ammunition used during the attack,” The New York Times reported Friday night, citing the search warrant documents.
Though Danley initially told investigators that she sometimes helped Paddock load magazines, the FBI said nothing indicated that she knew about Paddock's plans to carry out a mass shooting.
Ten pages of the search warrant documents remained sealed ahead of a Nevada state court hearing scheduled for Tuesday.
Law-enforcement officials believe the shooting was meticulously planned, and that after Paddock checked into the Mandalay Bay three days prior, he brought weapons and multiple rounds of ammunition to his room.
Paddock also set up cameras in the hallway outside the room. He fired more than 200 rounds through his room door and then killed himself before police arrived.