LAKE KATRINE, NY — An apartment building fire on Saturday left one unit badly damaged and damaged two adjacent units, displacing 10 adults, authorities said.

Firefighters work at the scene of an apartment building fire Saturday night in Lake Katrine, NY (Photo courtesy of Ulster Hose Co. No. 5)

Fire Chief Shawn Heppner of Ulster Hose Co. No. 5 said firefighters were called to report an apartment fire with an occupant trapped at 2071 Ulster Ave. at 9:33 p.m. Upon arrival, he added, they found heavy fire from an apartment. with flames spreading into the attics of adjacent apartments in an eight-unit building.

Firefighters were able to mount an aggressive attack on the blaze, while a search revealed no occupants inside, Heppner said. Firefighters brought the blaze under control at 10:21 p.m., he said.

The apartment with the fire sustained heavy damage while adjacent apartments sustained smoke, water and fire damage, Heppner said. The fire initially made all three units uninhabitable, but occupants of adjacent units were able to move back on Sunday afternoon, he added.

A firefighter was treated at the scene for minor burns, according to Heppner.

Ulster City Police Chief Kyle Berardi said on Sunday afternoon that the fire was “somewhat suspicious” in nature, but he warned the investigation was at too early a stage to offer More details.

The Hudson Valley chapter of the American Red Cross said in a news release that it provided immediate emergency assistance to 10 adults in seven households after the fire. The non-profit organization said it provides financial assistance that can be used for housing, food and clothing and offers health services and comfort kits containing personal care items.

Heppner said the cause of the fire was still under investigation by Ulster City Police and Ulster County Fire Investigation Division.

Firefighters were assisted at the scene by the Centerville-Cedar Grove Fire Department, City of Kingston Fire Department FAST Team, City of Ulster Police, Central Hudson and Mobile Services life support.