A faulty alarm system could be to blame for a prolonged fire at a commercial building in North Haven, officials say.

North Haven Fire Chief Paul Januszewski says the fire happened at around 3 a.m. Saturday morning at the Parker-Hannifin Corporation factory.

Officials say the fire alarm did not go off, thereby preventing a system notification to the fire department.

They say that while the building’s sprinkler system did activate, it took about two hours for crews to get the flames under control upon arrival.

Januszewski says the fire was declared a hazardous materials incident because a "large quantity" of acids and other chemicals spilled during the blaze.

No injuries have been reported.

The cause of the fire is under investigation.