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TORONTO – Boston firefighters were busy battling a massive eight-alarm blaze in a commercial building early Tuesday.

The fire broke out at a five-storey building around 4:30 a.m.

Firefighters arrived to see heavy fire and thick black smoke. It quickly escalated to a three-alarm blaze just before 5 a.m.

Windows on the first three floors were blown out by the intensity of the flames, as more fire crews were brought in to battle the inferno.

An eight-alarm fire was declared just before 5:30 a.m.

Boston Fire Department said cleaners were inside the building when the fire broke out. They managed to escape through an exit at the rear of the building.

No injuries were reported.

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Boston Fire Department’s official Twitter account gave a play-by-play account of the blaze and shared some incredible photos.

Heavy fire blowing out front windows http://t.co/z7fqKUSLd1 — Boston Fire Dept. (@BostonFire) December 3, 2013

Ladder pipes everywhere http://t.co/n35krvQrz3 — Boston Fire Dept. (@BostonFire) December 3, 2013

All companies working http://t.co/ZHxoP6ZQNa — Boston Fire Dept. (@BostonFire) December 3, 2013