Boxer Robert Guerrero has been arrested at New York's Kennedy Airport after police say he tried to bring a gun on a plane.
Queens District Attorney Richard Brown says Guerrero was arrested Thursday morning when he presented a locked gun box to a ticket agent during check-in.
Brown says the box contained an unloaded .40-caliber handgun and three unloaded magazines.
Guerrero was arraigned on charges including criminal possession of a firearm. He was released on his own recognizance.
If convicted, he faces up to four years in prison.
The 30-year-old Guerrero is the former featherweight champion and current WBC welterweight champion.
He is scheduled to fight Floyd Mayweather Jr. on May 4 in Las Vegas.
A spokesman for Guerrero did not immediately return a call seeking comment.