PALMER TWP., Pa. - Crews fought flames for hours at a facility housing three businesses in Palmer Township, Northampton County Wednesday afternoon.

Fire crews were dispatched shortly before 5 p.m. to Palmer Plastics at the 2900 block of William Penn Highway, county dispatchers said. 

Arriving crews found a piece of machinery on fire, said township Fire Chief Jim Alercia.

“By the time we got a knock on the fire the fire had already made its way up the wall and into the roof line that runs from one building to the next," Alercia said.

Fire crews then needed to trench cut the roof.

“We are going from the peak of the roof and we have to trench to the eaves of the roof,” Alercia said. "On this large roof it’s burning in certain spots so we have to make large enough cuts and then douse it with water to make sure the roof is actually extinguished.”

The fire was extinguished as of 11 p.m. Wednesday.

The origin of the fire was contained to a machine and a wooden break room that is next to the machine, Alercia said.

The large facility houses three separate businesses which are linked together under he same joining roof, which is why the incident was upgraded to a third alarm, Alercia said.

There were no injuries.

Investigators determined that the fire started in machinery that melts, filters, and reproduces plastic. A large ventilation exhaust system is above the machinery. The exhaust system helped spread the fire  through the ventilation system and along the interior of the ceiling. The fire was ruled accidental.