POMONA, Calif. >> Authorities are searching for two male suspects after a woman called 911 to say she was tied up in the trunk of a car stopped on a Southern California freeway onramp.

KNBC-TV reports California Highway Patrol officers who arrived on the scene late Monday in Pomona found the inside of the car empty, but when they opened the trunk, they found the woman bound with duct tape.

The car was stopped along the Dudley Street off-ramp of the eastbound Interstate 10.

Police say they’re looking for two males with shaved heads who are wearing dark clothing.