Last Updated: Tuesday, May 25, 2010 | 1:38 PM ET . CBC News : A four-seater plane has crashed into the roof of an office building in Markham, Ont.

Witnesses say the Cessna aircraft was trailing smoke and rolled before it crashed into the roof of the two-storey building.

The plane could been seen on the roof at Woodbine and Hooper streets, engulfed in flames.

The crash was reported at 12:26 p.m. ET, according to Const. Rebecca Boyd of the York Regional Police.

Boyd could not confirm how many people were on board.

"We're concerned about anybody who may have been in the area at the time," including pedestrians, Boyd said.

Police evacuated the building, believed to be a plaza, while firefighters tackled massive flames.

By 12:56 p.m., those flames appeared to have been reduced to smoke. At least six firefighters could be seen on the roof of the building.

Boyd did not say what may have caused the crash.

The plaza is located less than a kilometre east of Buttonville Airport.

The address is linked to Thinkway Toys, which manufactures and distributes toys internationally for Disney and Warner Bros., among others, according to Industry Canada.

Calls to the company were met by static and then cut off.

With files from The Canadian Press


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