A large fire in Portland's historic Old Port district on Friday evening caused significant damage, sinking a boat and heavily impacting a building on Custom House Wharf. Firefighters battled the three-alarm blaze for nearly four hours, containing it by 9:30 pm. One firefighter sustained minor injuries, with no civilian casualties reported. The fire's origin is under investigation, though witnesses reported seeing flames near an old warehouse and hearing a possible explosion. Power outages affected nearby properties, and structural damage to waterfront businesses is extensive.