File Photo – Illinois State Police | Photo via Max Weingardt

A man suffered life-threatening injuries after he was ejected approximately 20 feet from his motorcycle during a crash on Interstate 94 near Libertyville Wednesday afternoon.

The Gurnee Fire Department, Libertyville Fire Department and Illinois State Police Troop 15 responded around 3:35 p.m. Wednesday to Interstate 94 north of Route 137 for a vehicle crash with injuries.

Gurnee Fire Department Battalion Chief Tim Steffens told Lake and McHenry County Scanner the incident was initially reported to have involved a car and a motorcycle.

Crews arrived on the scene to only find a single motorcycle involved in the eastbound lanes at mile marker 13.

The car believed to have been involved was actually a bystander who stopped to help.

Steffens said an off-duty Lake Forest firefighter and four bystanders were aiding the downed motorcyclist.

The middle-aged male victim was semi-conscious and had suffered serious injuries, Steffens said.

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The man had been ejected approximately 20 feet from his motorcycle. It is unknown what he hit.

Steffens said there were no other damaged vehicles around and there was no sign of impact with the concrete median.

Paramedics transported him to Advocate Condell Medical Center in Libertyville.

The Illinois State Police said the man, who was the sole occupant of the motorcycle, suffered life-threatening injuries.

The two inside lanes were shut down for several hours while police investigated the crash.

The cause of the crash remains under investigation by the Illinois State Police.