MASON CITY — Firefighters are battling a blaze on Mason City’s north side this morning, which is also blocking off traffic on US Highway 65.

Firefighters were called around 4 o’clock this morning to Young Construction at 16th and North Federal. Smoke was billowing from the building shortly before 5 o’clock. No other details about the fire are available at this time.

US Highway 65 is blocked off between 14th and 17th Streets North.