Port Coquitlam firefighters are cleaning up after a large early morning fire destroyed a number of businesses in the city's downtown.

Mayor Greg Moore confirmed the four-alarm fire started in Martha's Bakery and Cafe which is located in a strip mall in the 2200 block of McAllister Avenue, between Shaughnessy Street and Mary Hill Road.

The Port Coquitlam Fire Department was called out around 4:30 a.m. PT this morning to the 2200 block of McAllister Avenue where a number of business were in flames. (Shane MacKichan)

"The fire started at one end of this building. There's five different businesses within this building and they're doing their best to contain it," said Moore. "It will be hard to tell the extent of the damage for a while."

The remains of Martha's Bakery and Cafe, where the fire reportedly started. (David Horemans/CBC)

A nearby apartment manager who identified herself only as "Rita" called 911 after being awaken by an explosion around 4:30 a.m. PT.

"The blast woke me up and I heard glass breaking. And I thought 'oh my what's that?'" she said. "I got up and looked out and could see the building from my house and it was in full flames. It spread so fast."

The bakery, a wellness centre and Curves Fitness have been badly damaged by the fire. Other businesses in the strip mall have sustained water and smoke damage.

Coquitlam firefighters were put on standby in the event Port Coquitlam Fire Rescue needed assistance.

City officials took to twitter to warn people about traffic closures in the area.

4th alarm fire 2200 blk McAllister. Roads closed: Mcallister: f/Mary hill-Shaughnessy, Mary Hill: Wilson-Kingsway. Avoid area <a href="https://twitter.com/AM730Traffic">@AM730Traffic</a> —@CityofPoCo

Last year a large fire about a block away gutted four business and closed Port Coquitlam City Hall.