PITTSBURGH � Free agent running back Mewelde Moore signed a

three-year contract with the Pittsburgh Steelers today.

Moore spent the first four seasons with the Minnesota Vikings.

Moore could compete for a spot returning kicks for the Steelers now that Allen Rossum is in San Francisco. He also could give the team insurance behind Najeh Davenport if Pro Bowl running back Willie Parker doesn't come back strong from a broken right leg.

Steelers coach Mike Tomlin was the Vikings' defensive coordinator before coming to Pittsburgh a year ago.