Firefighters entered M&Co in Helston after receiving a call saying the building was full of smoke.
The call came in at 11.32am today.
Three fire engines from Helston, Mullion and Penzance attended the scene and two officers entered the building with breathing apparatus.
They are currently using a thermal imaging camera to find the cause of the smoke.
Meneage Street is blocked and there is queueing traffic from The Parade to Market Place.
More to follow.
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