At least 15 people were displaced and three firefighters were injured in a fire at a triple-decker home on Stockholm Street in Worcester, Massachusetts, on Wednesday.

According to reports, the blaze started just before 1 a.m. EST. It elevated to a four-alarm fire within an hour, leaving the home charred. The fire crew along with the officials from the Bureau of Alcohol, Tobacco, Firearms and Explosives were at the scene.

Meanwhile, the Red Cross of Massachusetts was assisting the displaced. It was also reported that some people were hospitalized, however, the extent of the injuries was not known.

Three firefighters sustained injuries with one of them suffering potentially serious injuries. The cause of the fire was not known.

This is a developing story.