A trailer came loose from a truck and struck a second vehicle head on near Riverside Friday night. According to the Washington County Communications Office, at 9:49 p.m. the wreck was reported about 2.5 miles west of Riverside on Highway 22. A black Dodge truck left the scene after the trailer came loose and struck the second vehicle. No injuries were reported. Nathan Thomann of Riverside was driving the vehicle that was hit. Riverside Fire and Rescue, Riverside QRS, Iowa State Patrol, and Washington County Sheriff’s personnel responded to the scene. The trailer and Thomann vehicle were towed from the scene. The wreck is under investigation.