UPDATE AT 2:17 A.M. (WZZM) -- Authorities say all workers at a Florida propane tank plant have been accounted for after explosions rocked the facility, according to the Associated Press.

TAVARES CITY, Fla. (ABC News) - At least 15 people are unaccounted for after several large propane tanks exploded late Monday night at a gas plant in Tavares, Fla., sending "humongous" flames and smoke into the sky, according to officials.

The tanks began exploding around 11 p.m. at the Blue Rhino gas plant approximately 40 miles northwest of Orlando. Seven people have been transported to local hospitals with injuries and at least 200 fire personnel are on scene. There is no word on the condition of the seven people injured.

Fire officials said that 24 to 26 people were working at the gas plant when the fire broke out.

Ashley McCormick lives in neighboring Mount Dora, Fla., and told ABC News over the phone she could see the fire from seven miles away.

"You could definitely see the fire from across the lake. It was humongous even from seven miles away," McCormick said. "You could hear the explosions after another and then after it would explode a fireball would shoot up into the sky."

There were 53,000, 20-pound cylinders at the gas plant where explosions took place, officials said at press conference early this morning.

Officials said residents in the area are being evacuated and can expect evacuation orders to be carried out until 6 a.m.

"I have heard tons of booms for at least 30 minutes," Mount Dora resident Blake Cottle told ABC News affiliate WFTV.