LOS ANGELES (AP) — The FBI has arrested four Southern California men accused in a scheme to use stolen credit card numbers to fraudulently purchase fuel at gas stations.

FBI spokeswoman Laura Eimiller says three of the suspects were arrested Thursday by agents with a task force that includes federal and local law enforcement officers. A fourth man turned himself in on Friday. They face fraud and conspiracy charges.

Eimiller says agents observed the men on various occasions buying fuel at several Los Angeles gas stations using credit card account numbers later determined to have been used fraudulently. The gas was pumped into large vans or utility trucks outfitted with storage tanks that could hold hundreds of gallons of fuel.

The scheme involved identity theft against 50 victims and losses of more than $50,000.