Fire companies from Upper Providence, Lower Providence, Phoenixville, Trappe, Limerick and other nearby municipalities were dispatched to the GlaxoSmithKline campus in Upper Providence at about 9:15am in response to a reported electrical fire in one of the company's buildings.
Company spokesperson Sarah Alspach identified the building as Building 9 and described it as "a processing area for our investigational supply chain."
A reporter described "heavy smoke" and firefighters entering the building in breathing gear. Company security declined to allow photographs to be taken at the fire scene.
"Approximately 100 employees were evacuated from the building. No employees have been injured as a result of the fire. We do not yet know the extent of the damage or the cause of the fire," company spokesperson Sarah Alspach said in a statement.
Alspach said that due to a loss of electricity in the building, an employee was briefly trapped in an elevator.
"He was safely removed from the elevator and was not harmed," Alpach said.
The fire was extinguished around 10:15am, Alspach said. Fire units began departing the scene at about 11:10am.