Firefighter K. SandersonA fire broke out at a North Beacon Street house on Friday afternoon. It may have been caused by a lightning strike. A fire broke out at a home on North Beacon Street on Friday afternoon, and it may have been caused by a lightning strike. The fire alarm came in shortly after 4 p.m. and flames were coming out of the second floor when Watertown Firefighters arrived, according to the Watertown Fire Department. The fire was out by 6 p.m. and firefighters stayed afterward to check for hot spots.