OTTAWA -- Ontario Provincial Police is investigating two fatal collisions in McNab Braeside Township, east of Ottawa, this week.

On Thursday, officers responded to a single vehicle ATV collision on Scheel Drive at approximately 7:15 p.m.

An 80-year-old man from Braeside was transported to the Arnprior District Hospital, where he was pronounced deceased. A 59-year-old woman suffered minor injuries.

On Tuesday, officers responded to a call for a dirt bike collision near Usborne Street.

Police say a 15-year-old boy suffered serious injuries in the collision. He died from his injuries in hospital on Thursday.

Police say alcohol was not a factor in either collision.