LONGMEADOW >> State police are trying to figure out how a man fell out of a moving vehicle and ended up on the highway in Longmeadow.

It's unclear whether the man found on the southbound side of Interstate 91 on Thursday night fell accidentally, jumped or was pushed out of the vehicle.

WWLP-TV reports that the man was brought to the hospital, but the extent of his injuries was not known.

Police say another man was brought to the state police barracks in Springfield for questioning.

No names were released.

The highway remained open during the investigation.