By Kate Merrill

OXFORD (CBS) – A massive fire at an Oxford wood refurbishing company triggered concerns about air quality Wednesday night.

The fire started at The Jarmak Company on Old Webster Rd. at about 6:00 p.m.

READ MORE: Ball's Triple-Double Carries Hornets Past Celtics, 111-102

“Upon my arrival the fire was actually through the roof,” said Oxford Fire Chief Sheri Bemis. “We had multiple explosions going on; we haven’t confirmed or figured out what caused that.”

The fire quickly spread. Chief Bemis says firefighters were pulled back because the walls started to collapse on the structure.

READ MORE: 'It's Been A Big Relief': National Guard Deploys At Brockton Hospital

The former tenant of the building was a plastics company, so firefighters were concerned about the presence of chemicals. Late Wednesday firefighters said the air quality in the area was normal.

No one was inside, and no injuries have been reported.

MORE NEWS: Tewksbury Police Looking For Best Backyard Ice Rink For Pick-Up Hockey Game

Investigators say the cause of the fire is unknown.

Kate Merrill