Firefighters respond to a house fire near Blackman Street and 3rd Street in Harvard Sunday evening. | Photo: Alex Vucha.

Heavy flames and smoke poured out of a vacant Harvard home during a fire Sunday evening that remains under investigation.

The Harvard Fire Protection District responded around 9:38 p.m. Sunday to West Blackman Street and 3rd Street for a report of a structure fire.

Multiple 911 calls were received about the fire and police officers arrived first to find flames and smoke coming from a residence.

Harvard Fire Chief Lawrence Kane said that firefighters found fire coming from the rear of the house and initiated an aggressive interior attack.

Two hose lines were used and firefighters made entry into the home to extinguish the fire and perform ventilation, Kane said.

It was initially unknown if anyone was still inside the home. Firefighters searched and did not find anyone. It was later determined that the home was vacant.

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No injuries were reported. A damage estimate was not immediately available.

The cause of the fire is undetermined and remains under investigation, Kane said.