BOSTON (WHDH) - Four people have been displaced after firefighters knocked down a 2-alarm house fire in Mattapan.

Emergency crews responding to the scene on Hazelton Street around 6:45 a.m. Saturday found heavy fire showing from the first and second floors of an occupied 2.5-story building, according to fire officials.

The cause of the fire remains under investigation.

No additional information was immediately available.

This is a developing story; stay with 7NEWS on-air and online for the latest updates.

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