In the United Stares, at least five people were killed when a massive explosion rocked a gas power plant being built in Middletown, Connecticut on Sunday.Fire officials said, they suspect a natural gas leak caused the blast at the Kleen Energy Systems plant and that some of the 51 construction workers who were on the site may be trapped.Middletown Mayor said, search and rescue teams with dogs and multiple fire departments are still sifting through the rubble after the explosion and fire.Witnesses said flames shot up and black smoke billowed out of the blast site. Some people reported windows blown out and the force was felt as far away as East Haven, a distance of 30 miles.