Update 11:00 a.m. NBC Philadelphia is reporting that the fire is under control. One Dunkin' Donuts employee suffered severe burns while trying to extinguish the fire, NBC reported.
County radio reports indicate that fire crews at the scene are attempting to ascertain the source of a gas smell that has developed in the last several minutes.
Update 10:46 a.m. County radio reports indicate that PECO has shut off power to the section of the grid along Main Street affected by an underground transformer fire.
The precise extent of the power outage is not clear but appears to include most of the 100 block of Main Street.
Earlier story and updates below.
A fire has been reported at 151 W Main Street in Norristown.
Twitter handle @MontcoAlerts said there is fire showing from the outside of the business.
On Facebook, Montco Firetalk is reporting that the fire department is evacuating the business. He added that the Fire Chief from Norristown Fire Department, Thomas O'Donnell, is reporting that is a potential underground fire.
Main Street is shut down, as well as a number of the side streets, including Cherry and Lafayette Streets.
The Times Herald on Twitter is reporting there is smoke coming from the Dunkin Donuts at Main and Barbadoes Streets.
UPDATE: Norristown Fire Chief has confirmed with Patch that the fire was caused by workers on the Main Street Improvement Project, who hit an underground line that caused a feedback loop that fed back into the outdoor electrical box.
Fire crews are still working on the Dunkin Donuts which is still enveloped in smoke.
This is the same location that was the scene of an underground fire and explosion last year.
UPDATE 9:36 a.m.: The fire is knocked down at the scene.
Norristown, Bridgeport, Centre Square, Plymouth, Swedeland, Norriton Fire Companies are responding to the scene.
Norristown Patch will update this with more information as it becomes available.