We're hearing reports of an explosion of a gas line by the Kleen Energy plant on River Road that has left two dead and 100 injured. All of Middletown's fire departments are working at the scene, and Durham, Middlefield, Portland and Cromwell fire departments have been called in to assist.

There are reports of numerous casualties.

Four ambulances and a Life Star helicopter have been called to the scene. Most of River Road has been blocked off. Flames were shooting out of a pipeline at one point, but the gas line has now been shut off.

The incident, which happened around 11:30 a.m., shook most homes in Middletown and as far as Portland.

According to Middletown Fire Department Deputy Fire Marshall Al Santostefano, there were causalities, but he said he didn’t have the number. There were 50 construction workers on the site at the time of the explosion, he said. There were a number of buildings that were part of the Kleen Energy plant that were on a natural gas pipe line, and the explosion occurred at one of the larger.

According to the Hartford Courant, at least 100 were injured, according to medical personnel. Two were dead and four were critically injured.

Reporters have been sent away by emergency officials.

Search and rescue efforts are ongoing.

Fatalities and dozens of injuries are reported at a power plant explosion in Middletown Sunday morning and emergency crews said they are operating a search and rescue operation through the rubble.

Officials tell NBC Connecticut News there have been fatalities, but they aren't sure how many people were killed.

The explosion happened around 11:30 a.m. at the Kleen Energy Plant on River Road, a 620 megawatt gas-fired power plant.  The main building was levelled in the blast.

Gordon Holk, general manager of the plant, said he was enroute to the plant and did want to speculate on the number of injured.

Explosion Creates Search and Rescue at Middletown Power Plant

LOOK

Explosion Creates Search and Rescue at Middletown Power Plant

People Durham, Wallingford, Middlefield, East Hampton and as far away as Madison and Old Saybrook reported feeling the explosion.

51 people were working at the plant when the blast happened.  Rescue crews are now searching through the rubble to locate the injured.

Black smoke was seen billowing the plant along the banks of the Connecticut River.

Mutual aid was called in from the surrounding towns Durham, Haddam, Middlefield, Cromwell and Berlin.  Lifestar has been called to the scene to transport the injured.

Stay with www.nbcconnecticut.com for more information on this breaking story.