Obie Trice, a protege of Eminem, was shot early Saturday while driving on a city highway, police said.

Someone in another car shot through the back window of 28-year-old Trice's vehicle as he drove along the Lodge Freeway around 1:10 a.m., said Michigan State Police Sgt. Mario Gonzales.

The Detroit native managed to continue driving and got off the freeway in the suburb of Southfield, where his girlfriend, also in the vehicle, flagged down police, Gonzales said. The girlfriend wasn't wounded.

Police didn't release where the bullet struck Trice. He was taken to Providence Hospital, where he was treated and released, said hospital spokesman Brian Taylor.

There were no suspects in the shooting, which was under investigation by state police detectives, Gonzales said.

Trice contributed to the song "Drips" on Eminem's 2002 album "The Eminem Show" and got more exposure by delivering the opening lines "Obie Trice-real name, no gimmicks" on the lead single "Without Me."

In addition to Eminem, Trice also has rapped with 50 Cent. Trice's 2003 debut album "Cheers" was produced by Eminem, and he also had a small part in the feature film "8 Mile," which starred Eminem.

Trice was signed to Eminem's label, Shady Records, a joint venture with Universal Music Group's Interscope Records. Messages seeking comment were left Saturday for UMG and Shady Records.