HOLLAND TOWNSHIP, Mich. (WOOD) — A man was airlifted to the hospital after crashing with a semi-truck in Holland Township while rollerblading Saturday morning. Officers are asking the public for help finding the semi.

Around 10:45 a.m., officers with the Holland Department of Public Safety were sent to the area of E. 8th Street and Fairbanks Avenue after receiving reports that a person on rollerblades had been hit by a semi.

Police at the scene said that the 42-year-old man was airlifted to the hospital. His condition is unknown. Officers believe that he ran into the back of the trailer.

Officers are looking for the semi and believe it is a light blue tractor towing a double trailer. The department of public safety said that the driver may not know they hit the man.

Eastbound E. 8th Street was closed at the railroad tracks while crews investigated. It has since reopened.

It’s unclear what led up to the crash.

The crash remains under investigation.