Provincial police are looking for witnesses to a weekend crash involving seven vehicles in Chatham-Kent.

OPP officers responded to Highway 401, near Harwich Road on Saturday around 11 p.m., where a four-foot red steel ramp fell from a flatbed trailer, causing a multi-vehicle crash.

Investigators say seven vehicles sustained serious damage. However, no injuries are reported. The suspected vehicle responsible for the collision has not been located.

Anyone with information is asked to contact acting Sgt. Chris Hogg at 519-352-1122.