Jersey, the largest of the Channel Islands, is a self-governing dependency of the United Kingdom located off the coast of northern France in the English Channel.
Smith said a three-story building “completely collapsed” and a nearby building was also damaged. He described the scene as “devastating” and warned there could be more deaths.
Smith said firefighters were called to the area the previous night after residents reported the smell of gas.
He said police would investigate “whether or not there was a safety issue” with the natural gas lines.
Police said in a statement that while the fire was put out, emergency services were carrying out “extensive work” at the scene.
Authorities have advised Jersey residents to only seek emergency hospital treatment in the event of an actual medical emergency and to avoid the area of the blast, which has been cordoned off.