The Chatham-Kent OPP is investigating a tractor-trailer fire that closed the eastbound Highway 401 on Tuesday morning.

Police were called to the eastbound lanes of the highway, east of Orford Road, after reports of a fire shortly after 9 a.m.

A tractor-trailer loaded with auto parts reportedly caught fire, but it was quickly put out by the Highgate/Orford Fire Department.

The driver was not injured.

The cause of the fire has not yet been determined but the highway was reopened late Tuesday morning.