Las Vegas shooter was upset over way casinos treated him, new FBI documents say

New FBI documents released this week reveal that the Las Vegas shooter was upset with the way he was treated by casinos in the area prior to his deadly attack.

Stephen Paddock, who killed 58 people at the Route 91 Harvest music festival in 2017, was found to have been frustrated by his lack of success gambling and the way he was treated by casinos in the area.

According to the documents, Paddock had made numerous complaints to casino staff and was seen to be behaving erratically at times. He was also reported to have made disparaging remarks about casino staff and their policies.

The documents also reveal that Paddock had a long history of gambling and had been a regular in Las Vegas casinos for more than a decade prior to the attack.

Paddock was also said to have been in contact with several people prior to the attack, although their identities have not been revealed.

The FBI's findings are the latest development in the long-running investigation into the attack, which remains the deadliest mass shooting in modern U.S. history.

Authorities have yet to determine a motive for the attack, but the documents suggest that Paddock was driven by frustration and anger over the way he was treated by casinos.

While the documents do not provide any clear motive for the attack, they do shed light on Paddock's state of mind in the months leading up to the massacre.

The documents also show that Paddock had made several large purchases in the months prior to the attack, including a large cache of firearms and hundreds of rounds of ammunition.

The FBI has said that it is still working to determine the motive behind the attack and the investigation is ongoing.