KING OF PRUSSIA (CBS) — Firefighters extinguished a fire that broke out on the roof of a building at the King of Prussia Mall Monday morning.

The first started at about 10:30 a.m. at the Legal Sea Foods restaurant on W. Dekalb Pike.

Firefighters arrived at the scene and were able to quickly place the fire under control.

It was not immediately known if there was any damage to the building.

As for a cause, construction workers were on the roof welding at the time of the fire, but an exact cause remains under investigation.

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