A fire on the third floor of a Myrtle Street home ripped through the two-family house Wednesday morning and left six residents displaced, officials said.

No one was injured, but the fire burnt through the third and second stories of the home and left it inhabitable. Neighbors reported the fire at 10:09 a.m. Wednesday and it drew nearly the entire Norwalk Fire Department. Engines from nearby cities covered Norwalk fire stations while firefighters battled the blaze.

Heavy snows caused a nearby hydrant to freeze and break when firefighters tried to hook a hose to its valve, Norwalk Fire Deputy Chief Stephan Shay said. Firefighters found a second hydrant about 800 feet away and began dousing the flames using the working water source.

It took about an hour to contain the aggressive fire, Shay said.

The fire appeared to begin somewhere in the third floor. Fire marshals are investigating what caused the blaze, which left charred gaping holes in the back of the third floor. Ash and burnt pieces of wood covered the fresh snow the in the backyard.