BOSTON (CBS) — Firefighters fought a blaze at the partially-demolished Anthony’s Pier 4 restaurant early Monday morning.

The Boston Fire Department’s Marine Unit was called in to fight the fire on Northern Avenue, which began around 1:30 a.m. Monday.

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Firefighters fought heavy flames in the rear of the building, which was strewn with debris.

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One firefighter suffered an ankle injury and was treated and taken from the scene by Boston EMS.

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Investigators were at the scene Monday to determine the cause of the fire. Demolition of the iconic seaport district restaurant began last week.