He could not specify how many people were evacuated from the plaza but said given it was during the afternoon in the busy area of Newmarket, there were likely to have been a large number involved.
Juliette Veber was on Kent St and could see "grey billowy smoke" coming from the second story of the Newmarket Plaza foodcourt.
"I just saw smoke billowing out of the top of the carpark on top of the food court. It smells really smoky, everyone is outside watching."
One firefighter was in a cherrypicker being raised to the smoke's level, she said.