The double-decker No. 76 bus, heading downtown, was T-boned by a car after running a red light at about 7:45 a.m.
Ottawa police said the woman driving the car saw the bus heading through the red light. She tried to stop her car in time, but couldn't, said police spokesman Const. Marc Soucy.
The driver of the car suffered minor injuries but didn't need to be taken to hospital.
Sharon Wright, the driver of the bus, is facing a $325 fine under the Highway Traffic Act.
Internal investigation underway
Amalgamated Transit Union Local 279 president Craig Watson said an internal investigation is underway.
"In these cases, most cases like this, what happens is the operator is taken off work and they're put on what they call investigatory leave [to allow for] a full and thorough investigation," Watson said.
"We also have to be concerned with the operator here. The operator has to be safe and willing to come back to work. So there may be, obviously there's some trauma involved, and we'd want to make sure that the operator wouldn't be back behind the wheel until they're safe and they're feeling up to it as well.
"Unfortunately it's just one of those things that shouldn't have happened, and it happened."