One person seriously injured after minivan collides with tractor-trailer.

Authorities are investigating after a minivan and tractor-trailer collided in Manchester shortly after midnight Saturday.

Police said the tractor-trailer was turning left from Knox Street to Center Street when it was struck by a minivan traveling westbound on Center Street.

The driver of the minivan was extricated and taken to Hartford Hospital for treatment of serious injuries. The truck driver was not injured, according to police. Neither person has been identified.

The cause of the crash is still under investigation but police said speed or driver impairment was likely a factor.