At 12:06 the New Castle County Fireboard alerted the VHC for an unknown inside odor in the pharmacy of the Walmart store. Units arrived to find the occupants stating there was an odor in the area but were unable to identify or locate the source. Units checked the building and the roof and found minimal readings on the gas detection devices. A number of subjects were checked by EMS on the scene and transported. The scene was placed under control and turned over to the manager.