Firefighters in Smiths Falls, Ont., rushed to a call at the headquarters of marijuana manufacturer Tweed Monday morning.

A fire broke out just before 9:30 a.m. at 1 Hershey Dr., the former visitor centre of the town's famous chocolate plant.

The flames were under control within three minutes, according to the Smiths Falls Fire Department.

The fire department said the area where the fire broke out is undergoing extensive renovations, and said the flames were limited to that area. Neither Tweed's administration offices nor its marijuana production area was affected, the department said.

The building was briefly evacuated, but employees have now returned to work. No one was injured.

Production was not affected, the fire department said.

Smiths Falls fire Chief Normand Beauchamp said the cause is still under investigation.