Officials are working to figure out the cause of an early morning fire at a vacant building in Waterbury.
It broke out early Saturday morning in the area of 603 Watertown Avenue.
Fire officials told Eyewitness News the building was vacant at the time of the fire and no one was injured.
Crews were able to knock down the fire in about an hour, but remained on the scene for several hours.
Officials have not yet released any information about a possible cause.
The fire marshal is still investigating.
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