Nine firefighters were injured after an explosion leveled several buildings in Seattle early Wednesday, officials said.
The Seattle Fire Department said eight firefighters and a battalion chief were transported to the hospital following the "massive explosion" in the the city's northern neighborhood of Greenwood.
See more reports and pictures from the scene:
Seattle explosion leaves 9 firefighters injured
.@SeattleFire Chief Harold Scoggins said there is still an active gas leak and active fire at Greenwood scene. Gas is still flaring.
Photo courtesy: Seattle Fire Department
We have a total of 67 SFD personnel at 85th and Greenwood. Total includes firefighters, command staff and medics.
Komo photographer was on scene as the explosion happened in greenwood. Just stunning. https://t.co/NWOn0YRhNV
9 firefighters hurt in Seattle explosion: https://t.co/5tk2Qh7gRx https://t.co/Ndd6WQENZk
Fire just flared up again at #explosion scene north #Seattle #Greenwood #LiveOnKOMO https://t.co/rp6vYw0Ye2
Nine firefighters hurt in Seattle blast, residents evacuated - https://t.co/Ku3gdJa7S5 #abc13 https://t.co/yULXbfAj0J
Blast force so great that 1 witness tells me he heard it 16 blocks away #explosion #seattle #liveonkomo https://t.co/f6CiTBi8ER
Explosion rocks Seattle; 9 firefighters hurt
Watching video come into the newsroom from scene of Greenwood explosion #seattle incredible @KIRO7Seattle at 4:30AM https://t.co/3NsKc6QtM2
Friend who lives near Greenwood explosion told me it woke her up. She says "the convenience store is rubble." https://t.co/gQM2GVoon7
Here's a look at the Chocolati Cafe just across the street south of the explosion. Glass everywhere. #LiveOnKOMO https://t.co/poGp9NiPcv
Explosion shattered windows at nearby buildings! #liveonkomo https://t.co/tZwYeEmTU3
Windows blown out next to the Quickstop market on Greenwood. #greenwoodgasexplosion. #LiveOnKOMO https://t.co/cHJsaKh68V
Windows at Chocoloti espresso blown out. 200+ feet away from #greenwoodgasexplosion. #LiveOnKOMO https://t.co/qdyXtg1xAK
At least 17 fire vehicles were at the scene after what one resident described as "an extremely loud boom."
It was not immediately clear what caused the explosion or how the firefighters were injured. NBC News was unable to immediately reach fire officials for more information.
Dozens of residents said on Twitter they had been woken by the blast at around 1:40 a.m. (4:40 a.m. ET).
"It shook the house," 40-year-old Josh Koolbaugh, who lives a couple of hundred feet away, told NBC News by phone. "It sounded like an extremely loud boom."
Koolbaugh, who works for Boeing, walked to the scene after the blast woke him and his wife.
"I saw three buildings that were all leveled," he told NBC News.
He said at least three buildings had been destroyed: a local coffee shop, a restaurant and a grocery store.
Emily Pfeifer, a 23-year-old graphic designer who lives four blocks away, said she "heard a low boom and was rocked from a dead sleep, like a single gentle shove."
"The rocking was accompanied by the sound of things shaking briefly in my room. With the sound and movement at the same time. I thought a car must have hit my building."