The gunman responsible for the Las Vegas shooting reportedly had set up a camera inside of his hotel room.
On Oct. 1, 64-year-old Stephen Paddock smashed open the window of a suite on the 32nd floor of the Mandalay Bay Resort and Casino, located on the Las Vegas Strip, and opened fire on a concert crowd down below, according to the Chicago Tribune.
Paddock fired rounds for an 11-minute stretch in what became the deadliest mass shooting in modern U.S. history. He ultimately killed at least 58 people and injured over 500 more, according to CBS News, before then killing himself.
"It was preplanned, extensively, and I'm pretty sure that he evaluated everything that he did in his actions, which is troublesome," said Clark County Sheriff Joe Lombardo according to the Chicago Tribune.
On Oct. 3, two days after the attack took place, the New York Post reported that, according to Las Vegas Metropolitan Police Department Undersheriff Kevin McMahill, Paddock had set up three cameras in the hotel: one in the hotel room near the peephole and two outside in the hallway.
The Chicago Tribune reported that at least one of them was disguised as a food service cart.
Officials have said that the cameras were meant to help Paddock to monitor police activity. However, they also said it was unclear how he had been monitoring them.
"I anticipate he was looking for anybody coming to take him into custody," said Lombardo, according to CBS News.
Lombardo also said that all digital and electronic evidence had been taken into custody by the FBI.
A Las Vegas SWAT team stormed Paddock's room the night the shooting took place but found him already dead inside. Authorities have said that that a total of 23 guns were found inside of Paddock's suite. An additional 19 were also found in Paddock's home in Mesquite, Nevada, located approximately 90 miles away from Las Vegas.
According to BBC News, the shooting has sparked debate over gun laws in the country. U.S. President Donald Trump called Paddock "a sick man, a demented man," but later said that discussion over what needs to be done was "not for now."
On Oct. 2, a day following the shooting, ISIS claimed to be behind the attack, saying that Paddock had converted to Islam. However, the group provided no evidence to support that claim and the FBI said that it had found "no connection to an international terrorist organization."
According to the Chicago Tribune, authorities are still trying to determine the motive behind the shooting.