A massive fire broke out early Tuesday at an assisted-living facility in Rockland County — killing at least one resident, and leaving a firefighter unaccounted for.

Officials responded to a call about the fire at the Evergreen Court Home for Adults on Lafayette Street in Spring Valley minutes before 1 a.m., officials said. 

Dramatic video shows heavy flames and smoke shooting out of the building, which is surrounded by firefighters, medical personnel and other first responders.

There were “numerous reports of residents trapped,” Rockland County fire coordinator Chris Kear said at a morning press conference.

Ten residents were taken to local hospitals, where one died, he said. The conditions of the others were unclear. In total, between 25 and 30 residents were rescued. 

Approximately 100 to 125 residents lived in the building — but the exact number of people who were there at the time has yet to be determined. 

In a statement Tuesday, Evergreen Court Director Denise Kerr said there were 112 residents at the time of the fire — all of them accounted for. 

“This is an unspeakable tragedy at Evergreen Court Home and our hearts and prayers to go to all individuals and families who have been impacted,” Kerr said. “Our staff was truly heroic in evacuating residents who were inside the building as the fire spread, and we are forever grateful to the first responders whose actions undoubtedly saved lives.”

She said the residents were placed in a new home. 

A Spring Valley firefighter who was on the building’s third floor — which collapsed during the intense blaze — is unaccounted for, according to Kear. He was one of the first firefighters to arrive on scene, the official said.

“There was a mayday called by this firefighter,” he said. “The mayday was answered; however with the extent of the fire, the volume of the fire, the conditions were just too unbearable … firefighters went in and they could not locate the firefighter, [so] they had to back down.” 

Kear initially said he may have been trying to save a female resident, who was also unaccounted for, when he became trapped, Kear said.

But officials confirmed in the afternoon that the resident has been found and is unharmed. 

Kear said “there’s always hope” the firefighter will be found alive. 

“Firefighters could not deal without any hope,” he said. 

The cause of the fire is under investigation. The probe will determine whether the “very old” building was properly equipped with smoke alarms.

About 125 firefighters from multiple volunteer agencies worked together to battle the blaze.

“The wind started blowing everything,” said witness Damion Roscoe, the superintendent of the nearby Lakeview townhouse complex. “The fire was very high. It looked like one of those [shows] — ‘Walking Dead’ or something.”

Edgar Giovanny Cajas, who lives across the street, said he first started smelling smoke around 11 p.m. Monday and seeing flames about a half-hour later. 

“Then the building collapsed at 1 am and everything started,” he recalled. “The flames started falling on my roof. I had to wake my family up. I went up there with the hose because I feared it could set the house on fire. Nobody came to help us.”

Witness Maria Lopez, 35, who lives across from the facility on Lafayette Street, where the building was crumbled into heaps of splintered wood and metal, said she “saw people coming out yelling and crying.”

“You could hear their screams,” she said. “Imagine how they felt, some of them couldn’t walk.”

Fire department trucks continued to battle the remnants of the fire Tuesday afternoon, and Kear owed that too “sheer size of the building and the amount of the fire.”

“It’s one of your worst nightmares,” he said. “It’s not your typical house fire where there’s five or six residents. You’re talking about an adult care facility where you have over 100 people.”

Gov. Andrew Cuomo called the fire “deeply alarming,” and said state agencies have been directed to assist in the emergency response.

“On behalf of the family of New York, my heart breaks for those who lost loved ones in the fire, and we pray that anyone else involved is safe,” he said. “The State will continue providing whatever support is needed to ensure that happens.”