SILVER SPRING, Md. (AP) — Ten people were taken to hospitals, including several people with serious injuries, after an explosion and fire at a Maryland apartment building Thursday morning, a fire official said.

Firefighters responded around 10:30 a.m. after 911 callers reported an explosion at the four-story building in Silver Spring, less than a mile north of Washington, D.C., Montgomery County Fire & Rescue Service Chief Scott Goldstein said during a news conference.

Charred rubble is seen after an apartment building collapsed after an explosion this morning in Silver Spring, Md., Thursday, March, 3, 2022. Montgomery County Fire and Rescue Service reports that multiple people were critically hurt in the fire that started at about 10:30 a.m. at a four-story building at the Friendly Garden Apartments in Silver Spring, Md. (AP Photo/Alex Brandon)

Crews arriving on the scene found significant fire and evidence of an explosion, Goldstein said. They immediately went to work battling the flames and helped several people get out before the building was completely consumed by fire and there was a collapse, he said. Crews brought 10 people to local hospitals, he said. Several people had serious injuries and others had injuries that were more minor, he said.

There were still pockets of fire in the building after noon, he said. People were evacuated from adjacent buildings and he said the structural damage could be significant. Crews were searching the buildings a second time to make sure no one was missed.

It’s not known how many people are unaccounted for and how many people will be displaced, Goldstein said.

It’s not clear where the fire began and too early to say how it started, he said.

About 150 personnel from across the region responded to battle the blaze, Goldstein said.

“It’s kind of scary looking at the extent of the explosion and it’s hard not to imagine the impact it’s had on people,” Montgomery County Executive Marc Elrich said. “It’s definitely a tough day.”