Las Vegas shooter left behind calculations for targeting crowd, source says (Source: CNN)

A handwritten note in Stephen Paddock's hotel room contained calculations pertaining to the distance and trajectory from his 32nd-floor window to the crowd of concertgoers he targeted below, according to a law enforcement source with knowledge of the investigation.

CNN has previously reported that a note containing only numbers was found in the room. Those numbers were characterized as being significant to the gunman.

CBS News' "60 Minutes" first reported that Paddock's note contained handwritten calculations.

The note was found in the hotel suite at the Mandalay Bay Resort and Casino among 23 firearms, ammunition and the gunman's dead body. Paddock took his own life, authorities have said, after killing 58 people and wounding nearly 500.

Investigators have been combing through evidence left behind and Paddock's background for any hint as to what led the retired accountant to amass an arsenal of high-powered assault rifles, meticulously map out an attack and open fire on the crowd at last weekend's Route 91 Harvest Festival.