Niagara police are looking for witnesses to a two-vehicle crash in Welland.
It happened just before 9:00 p.m. last night (Sunday) at the intersection of Moyer Rd. and Biggar Rd.
Police say the driver of a Mazda failed to stop for the stop sign at the intersection and collided with a northbound Ford.
The Ford rolled several times before coming to rest on its roof.
A 72-year-old Niagara Falls man was taken to the Niagara Health System.
The 78-year-old woman driving the Mazda was air-lifted to hospital in Hamilton with serious injuries.
No names have been released.
The intersection was closed for several hours as police investigated the crash.
It re-opened at 9:30 a.m.