Shelton firefighters responded to a call involving an odor of gas inside a unit at the Shelton Avalon apartments on Canal Street on Thursday night. (Photos by Brad Durrell) Multiple fire vehicles and at least one ambulance went to the downtown structure so personnel could look into the situation, at about 7:30 p.m. \u201cWe\u2019re checking now but haven\u2019t smelled anything,\u201d an emergency worker said at the scene. Shelton Fire Chief Fran Jones later said firefighters responded to a report of a gas small inside the large apartment complex on the Housatonic River. \u201cNo hazard was found,\u201d said Jones, noting firefighters also checked gas meters in the structure for any irregularities. The 250-unit Shelton Avalon opened in March 13.