Ottawa police are investigating after an elderly man was struck by a school bus in the New Edinburgh area Friday afternoon.

Paramedics say the 81-year-old man was struck by the bus shortly before 4 p.m. at the intersection of Beechwood Ave. and Springfield Rd.

Ottawa firefighters had to free the man's leg which was pinned under the bus.

A woman who was at the scene shortly after the collision told CTV Ottawa she went to the man’s side while he was pinned underneath the bus.

She thought he might need CPR, but she says he was breathing, so she stayed with him, holding his hand, until emergency crews arrived. He was semi-conscious when they got there.

He was rushed to the Trauma Centre in critical condition, with serious injuries to his head, chest and leg.

None of the students on the bus at the time of the collision were injured. Neither was the driver.

Police closed the intersection for several hours Friday evening to investigate.