INDIANAPOLIS (AP) - Authorities say an off duty Indiana State Police detective has suffered "critical injuries" in a motorcycle crash in Indianapolis.

    

Police say the 24-year veteran of the department was riding in his personal motorcycle when a car collided with the bike, causing the detective to hit a semi-trailer on Interstate 465 south of Interstate 69.

    

The crash happened Saturday morning.

    

Authorities say the vehicles were approaching slowing traffic in a construction zone.

    

Police the detective suffered "critical injuries," despite wearing a helmet.

    

Police believe alcohol was not a factor.

    

The crash remains under investigation.