The Maine Warden Service is investigating a single snowmobile crash that took place overnight in Aroostook County. Luke Beaulieu, 57, of Saint David, was riding his 2006 Arctic Cat off the Gagnon Road in Madawaska when he collided with a tree around 11:00 last evening. Beaulieu sustained serious injuries when he was thrown from his snowmobile. Beaulieu was initially transported to Northern Maine Medical Center in Fort Kent where he was then taken to Northern Light Eastern Maine Medical Center in Bangor where he remains in critical condition. Game wardens say speed and alcohol are likely contributing factors.