The emails discussing bump stocks appeared to be sent between two accounts on July 6, both of which were run by Paddock, the Las Vegas Review-Journal reported.
Authorities still do not know Paddock's motive for the attack and the investigation is still ongoing. The judge did so in response to a lawsuit filed by CNN and other media organizations. An agent wrote in the search warrants that "if there were any information related to a potential conspiracy, it would be found within" the locked phone, which operated on the Google platform, meaning that it nearly certainly was not an iPhone.
If there was a second person involved in the communications, an Federal Bureau of Investigation agent wrote, "investigators need to determine who was communicating with him about weapons that were used in the attack".
One of the warrants describe the extent to which Paddock went to conceal his actions, saying he "destroyed or tried to hide digital media devices".
Drapes billow out of the room at the Mandalay Bay Resort and Casino following a deadly shooting at the Route 91 country music festival in Las Vegas. Authorities noted, however, that they did not rule out the possibility.
One warrant for Paddock's hotel room resulted in the recovery of three cellphones. It is not known who the latter email account belongs to.
"Paddock used the bump stocks, an after-market weapon accessory, along with AR-style semi-automatic rifle to fire thousands of rounds at a high rate at the concertgoers from a room on the 32nd floor of the nearby Mandalay Bay Hotel".
Marilou Danley, the girlfriend of Stephen Paddock.
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The FBI returned to the house a week later for what officials called "redocumenting and rechecking". She "corroborated much of what had been previously deduced by investigators", an agent wrote in one filing, and remained "adamant" she was unaware of Paddock's intentions.
This undated photo provided by the Las Vegas Metropolitan Police Department shows Marilou Danley.
In the days after the shootings, authorities called Danley a "person of interest".
Investigators found no evidence that Paddock had help carrying out the attack.
In her statement after the shooting, Danley said she had assumed Paddock was breaking up with her, continuing that it "never occurred to me in any way whatsoever that he was planning violence against anyone".
They also show that agents sought the email, Facebook and Instagram accounts of Paddock's girlfriend, Marilou Danley, who was in the Philippines during the October 1 shooting. In one affidavit, the Federal Bureau of Investigation notes that Danley's Facebook account was set to private and then deleted in the hours after the shooting.
Paddock outside the room. and then killed himself before police arrived.
"Investigators have been unable to figure out why Stephen Paddock would be exchanging messages related to weapons that were utilized in the attack between two of his email accounts".