Firefighters have freed a woman who was trapped in a car after head-on collision near Ancaster that sent her and four other people to hospital. 

Just before 12:40 on Sunday, two vehicles collided on Wilson Street between Highway 52 and Alberton Road, said Hamilton Fire Department spokesman Claudio Mostacci.

The crash involved a sedan and an SUV, said Ian Wright, a commander with the Hamilton Paramedic Service.

Firefighters, he said, had to extricate a woman in her 20s from the sedan, he said. When she was freed from the wreckage around 1:15 p.m., paramedics rushed her to Hamilton General Hospital in critical condition, Wright said.

Four occupants of the SUV — three 17-year-old males and a 45-year-old woman — were also injured the collision. Paramedics transported the three boys to McMaster Children’s Hospital with minor injuries, while the woman was taken to St. Joseph’s Hospital with “serious, but non-life-threatening” injuries, Wright said. 

Hamilton police staff Sgt. Clint Twolan said Wilson Street in the area of Alberton Road was closed on Sunday afternoon for the cleanup. 

Police don't yet know whether speed or alcohol were factors in the crash, he said at around 1:45 p.m. 

"Our collision reconstruction team is investigating."