FBI documents reveal Las Vegas shooter's anger towards casinos as possible motive for mass shooting.

The FBI has released documents that suggest the Las Vegas shooter who killed nearly 60 people in 2017 was "very upset" about how casinos were treating him. Stephen Paddock, a regular gambler with a bankroll of $2 to 3 million, had a penchant for video poker and was described as a high roller. A fellow gambler told the FBI that Paddock was angry about being banned from certain events, hotels, and even casinos. The acquaintance believed the stress about high roller treatment could "easily be what caused Paddock to 'snap.'"