Sarah Pacey said she demanded to speak with a bus driver's supervisor after the driver refused to let her on with a stroller. (CBC)An Ottawa bus driver has been suspended after driving away with a two-year-old girl while her mother screamed and chased the vehicle.

"I lost it. I was screaming, I was shaking, I was running, everything — it's unreal the emotions I was feeling at the moment," said Sarah Pacey, 24, who has filed a police report about the incident on Saturday night and said she wants the driver fired.

OC Transpo head Alain Mercier said Monday that the public transit company is investigating and will decide the driver's fate later this week. However, bus drivers are always pulled from service pending a formal review following incident like this one, he said, and the driver involved will report for a retraining program starting Tuesday that includes a "large segment" on handling situations on buses.

The course is part of mandatory cyclical training for all drivers, however certain drivers are deemed priority cases and put through it sooner.

Pacey said she had been preparing to board with her two-year-old, Aimee, and her seven-month-old baby Lea-Marie on Innes Road, when the driver refused to allow her stroller on the bus because someone else was already waiting with another stroller.

Pacey, who estimated there were about 10 people on board the bus at the time, told the driver he couldn't refuse two strollers.

"And he says, 'Yes, I can … and I was like, 'Whoa, I want to speak to your supervisor – you're not going anywhere,'" she said.

'I'm sorry Mummy, I didn't mean to'

Aimee, 2, got on the bus and sat down while her mother was still at the curb. (CBC)Meanwhile, Aimee had gotten on the bus and sat down, as was her routine. The driver closed the doors and drove off with her mother still on the street, Pacey alleged.

"I looked at the bus and I see her head as it's driving by," alleged Pacey, who panicked and started running after the vehicle.

A woman standing nearby also ran after the bus, and it stopped about 100 metres down the street, Pacey said.

A passenger helped Aimee get off the bus.

Pacey said the toddler kept apologizing.

"'I'm sorry, Mummy, I didn't mean to. I'm so sorry' — she kept saying that. And I had to keep telling her, 'You did nothing wrong.'"

Pacey called police, and once an officer had taken down a report, an OC Transpo supervisor arrived on the scene and apologized, according to Pacey.

But Pacey said that's not good enough, and she wants to see consequences for the driver.

"He better lose his job and a lot of people owe me a lot of apologies," she said. "He did a cruel, cruel thing and he did it to my daughter."

Mercier confirmed Monday afternoon that the child was separated from her mother, and said that was unfortunate and unacceptable from OC Transpo's perspective.

"We pride ourselves in the bus being a safe haven," he said.

He also confirmed that there was a dispute concerning strollers.

OC Transpo has no clear policy at the moment on strollers, Mercier said, but drivers do have discretion to determine whether it's safe to have strollers on the bus where they might obstruct the aisle. However, in this case, safety doesn't seem to have been an issue, he added.