Almost 500 pages of unsealed FBI documents on the Las Vegas shooting, and the alleged shooter Stephen Paddock.

Documents show that FBI agents knew the gunman behind the deadliest mass shooting in modern U.S. history left behind stockpiles of guns, ammunition and explosives when they sought warrants to search his properties and online accounts.

These unsealed FBI documents shed new light on the worst mass shooting in US history.

Details about Stephen Paddock's motive in the Las Vegas shooting remain a mystery.