Madurai: At least six workers were injured when iron scaffolding of a private warehouse under construction at Vaikom Periyar Nagar near Avaniyapuram collapsed on Friday evening. Police said around 30 people, mostly migrant workers, were engaged in erecting the iron scaffolding. They were trapped under the debris when the scaffolding suddenly collapsed in the evening. Police and fire and rescue service personnel rushed to the spot on receiving information and rescued the trapped workers, six of whom suffered bleeding injuries. The injured were rushed to a private hospital, where four were treated as outpatients while two others were admitted. The Avaniyapuram police have registered a case and are investigating.