Two firefighters had minor injuries battling a blaze at a commercial building early Monday in Port Washington, fire officials said.

Several fire departments, including Port Washington, responded to the fire at 2 Haven Ave. at about 12:08 a.m., according to Brian Waterson, assistant fire chief for the Port Washington department.

Waterson said the building, primarily office space, was unoccupied at the time of the fire.

The cause of the fire, according to the Nassau County fire marshal, was an electrical issue on the second floor, Waterson said.

"When we arrived on the scene, there was extensive smoke on the second floor and fire in the ceiling on the whole side of the building," Waterson said.

Two firefighters with minor injuries -- one for smoke inhalation, the second for hypertension -- were treated and released, he said.

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Waterson said firefighters needed about three hours to get the blaze under control. Other departments responding included Manhasset-Lakeville, Roslyn, Plandome, Great Neck Vigilance and East Norwich.

The building was severely damaged, he said. "It's going to need extensive repairs."