A three-alarm fire ripped through the Long Island City outpost of Xi'an Famous Foods Thursday afternoon, according to the Fire Department. One civilian sustained non-life-threatening injuries.

The fire broke out around 1:20 p.m. at 26-19 Jackson Avenue. It was reported under control within a couple of hours, according to FDNY.

It's currently unclear what caused the fire, but fire marshals are investigating. Xi'an Famous Foods' founder and chief executive officer Jason Wang said the fire did not start in the kitchen but on the roof.

"The fire did not originate from the kitchen. It seems to be from the roof, within the walls somehow. So we're still investigating," Wang said in a phone interview. "I don't want to put blame on anyone without knowing the full report from FDNY but it is definitely not from the inside of our kitchen."

"Typically, I think people...think that it might be some sort of oversight in the kitchen. I can assure that our kitchen staff did not cause a fire inside the kitchen," Wang added.

140 firefighters and personnel responded to the blaze. Dramatic video taken by witnesses show flames shooting out of the roof of the restaurant as firefighters spray water into the hole. Later photos show the top of the restaurant's roof destroyed by the fire.

One patron said he was in the restaurant when "the smoke started pouring in from the HVAC vent...very scary."

Wang said he did not know who the injured civilian was, but that the restaurant was evacuated due to smoky conditions and the flames broke out after FDNY was already on scene.

FDNY photos show smoky conditions throughout the neighborhood.

Xi'an Famous Foods tweeted that the restaurant would be closed until further notice, and that "everyone is safe, and thanks for your understanding."

Wang said his 16 restaurants have never experienced a fire before, and he didn't know how long it would take to re-open the restaurant.

"We don't know how long it takes to get back," he said. "Our engineers are going to have to evaluate the integrity of the building...and see what to basically do for next steps for the building."