Three men, including an active duty U.S. Navy SEAL, have been arrested for allegedly selling machine guns and other firearms to an undercover law enforcement officer in Nevada and Colorado, the U.S. Attorney General's Office in Nevada told CNN.

The weapons part of the alleged firearms trafficking were machineguns smuggled into the United States by special forces military personnel returning from Iraq and Afghanistan.

Nicholas Bickle, 33, of San Diego, Richard Paul, 34, of Durango, Colorado, and Andrew Kaufman, 36, of Las Vegas, were arrested Wednesday.

Court documents identify Bickle as a U.S. Navy SEAL assigned to a unit in the San Diego area. The machineguns were found to have a mark used by the Iraqi military to signify ownership, the the U.S. Attorney General's Office said.

If convicted, the defendants face up to five years in prison on the conspiracy charge and a $250,000 fine.