A semi truck rolled over Wednesday and spilled diesel, prompting a lane closure at westbound Interstate 10 in Chiriaco Summit.
The rollover was reported shortly before 10:30 a.m. Wednesday, according to the Riverside County Fire Department.
The agency said crews encountered the semi on its side and it was blocking the No. 2 lane.
County Environmental Health and a hazmat team were requested to assist at the scene.
No injuries were reported.
The cause of the accident was not immediately known.