Crews are investigating a fire at an old gymnasium on Main Street in Hartford on Sunday morning.
Firefighters were called to the vacant building in the 1600 block of Main Street around 6 a.m.
There was lots of smoke and heavy flames coming from the building when crews were called.
According to authorities, the building has been the scene of several fires before.
Get Connecticut local news, weather forecasts and entertainment stories to your inbox. Sign up for NBC Connecticut newsletters.
It's unclear what may have started the fire.
