By Jan Carabeo

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HORSHAM, Pa. (CBS) — Investigators are trying to determine what sparked a fast-moving house in Horsham, Montgomery County, on Friday morning.

Four townhomes were burned, two people were injured, and now a community is coming together to support those who are left picking up the pieces.

“It’s absolutely frightening and sad,” neighbor Molly Kelly says. “I don’t want to say chaos because it was well run, but it was chaos.”

Eyewitness photos show the heavy flames and thick smoke firefighters encountered around 3 a.m. along Manor Drive. It took 100 firefighters from 15 different companies to get those flames under control, as well as rescue a man who was trapped on his back deck.

“We typically don’t do four alarm fires, so this taxed us,” Horsham Fire Company Chief Lee Greenberg says. “But the crews worked together, and we were able to rescue the victim.”

That man was airlifted to the hospital, critically injured with burns. His wife made it out of their home unhurt.

The fire spread from their home to three other homes.

Meantime, a police officer was taken to the hospital after suffering smoke inhalation.

“Everybody cares about each other, and we’re just praying,” Kelly says.

Kelly lives down the street from where the fire started, but within the 55 and older community called the Carriage House Manor. It’s a place where everyone knows his or her neighbor. She’s praying hers pulls through, and says the community is ready to help the eight people who are now displaced.

“Everyone is just going to jump in and help,” Kelly says. “Get organized, until they can get the help they need to rebuild.”