Radnor Fire Company responded shortly after 4 p.m. Sunday to a 3-alarm fire in the 900 block of Atwater Drive in Tredyffrin Township, Chester County. More than 150 firefighters and companies from throughout Chester, Delaware and Montgomery Counties were tapped for a large fire that ripped through a building under construction

Squad 15, Chief 15 and a crew of six Radnor firefighters helped battle the blaze for more than 6 hours.

According to 6ABC News, firefighters arrived to the scene around 3:30 p.m. with fire showing from the upper floors of the structure.

"We did have a partial collapse on the first floor on the southern side of the building, which also hindered fire attack," said Chief Andrea Testa with the Paoli Fire Company, according to 6ABC news.

The five-story building is a retirement community still in progress called Echo Lake. No one was living in the building at the time of the fire.
Fire officials say the fire started in the basement and spread into the upper floors.

As night fell, the winds picked up, and with two-thirds of the building still under construction, firefighters were met with challenges."No stairways. Floors with holes in them. A lot of construction debris. That and the wind conditions have made this very difficult," said Testa.

The cause of the fire remains under investigation. Squad 15 was cleared from the scene by 10 p.m.