Suspect Stephen Paddock spent "tens of thousands of dollars" gambling in Las Vegas casinos in recent weeks, law enforcement officials tell NBC News. It’s unclear if he was winning or losing money off these large transactions, or if the gambling had any connection to the shooting.

One of the suspect's brothers, Eric Paddock, told NBC News earlier today that the suspect regularly spent time gambling and visiting the casinos in Las Vegas, some 80 miles away from Mesquite, Nevada, where the 64-year-old suspect was retired.