PITTSTON, Maine — A 22-year-old local man was seriously injured after a dirt bike accident Sunday evening on Troop Road in Pittston, according to the Kennebec County Sheriff’s Office.

Michael Lund, 22, was in critical condition Monday night after suffering serious injuries when he crashed his dirt bike shortly before 6:45 p.m. Sunday, according to Capt. Daniel Davies.

Lund, who was not wearing a helmet, was riding on Troop Road, a paved road connecting Route 194 and Wiscasset Road. While friends of Lund were in the vicinity, he was riding alone.

“His friends reported that he went down the road, they heard him accelerating and stopped hearing the engine,” Davies said Tuesday. “At some point, just a few moments later they went to look for him.”

Lund was taken by LifeFlight of Maine helicopter to Central Maine Medical Center. Messages seeking an update on his condition Tuesday were not immediately returned.

Davies said it is unclear what caused the accident, and that no reconstruction is planned because it was a single-vehicle accident.

The Pittston Fire Department, Gardiner Rescue and Kennebec County Sheriff’s Office responded to the emergency.