A note discovered in the hotel room of Las Vegas shooter Stephen Paddock featured hand-written calculations on where he needed to aim to increase his accuracy and number of kills, US network CBS reported on Saturday.

The piece of paper was found by police officers who stormed Paddock’s room after he launched his attack from the 32nd floor of the Mandalay Bay hotel on Sunday night – killing 58 people and injuring nearly 500.

In an interview set to air on Sunday, Officer David Newton of the Las Vegas Police Department’s K-9 unit, told CBS’ "60 Minutes" he noticed Paddock’s note "on the nightstand near his shooting platform."

"I could see on it he had written the distance, the elevation he was on, the drop of what his bullet was going to be for the crowd. So he had had that written down and figured out so he would know where to shoot to hit his targets from there," he said.

Newton added that forcing entry into the room with an explosive before finding Paddock’s body and an arsenal of weapons was like something "out of a movie."