OAKLAND — The California Highway Patrol has lifted a Sig-alert that closed lanes of eastbound Interstate 580 after a driver was struck by a bullet, authorities said Monday.

Around 8:20 p.m., a 50-year-old Oakland man was driving on eastbound I-580 lanes near Edwards Avenue when a bullet came through his windshield from an unknown direction, CHP Officer Matthew Hamer said.

The bullet struck the man’s steering wheel, hitting his finger. After officers responded, they began running traffic breaks along traffic lanes to search for bullet casings in case the bullet came from a motorist, Hamer said.

Officers also issued a Sig-alert, which blocked lanes of I-580 at Seminary Avenue and the Seminary on-ramp, just before 8:30 p.m., CHP Officer Damian Cistaro said.

Just before 9 p.m., that alert was updated to include a shutdown of Highway 13 lanes transitioning into eastbound I-580.

The alert was lifted at 9:52 p.m., the CHP said.

Contact George Kelly at 408-859-5180.