At least 20 people were killed and many injured when a bridge collapsed near Genoa, Italy The bridge crumbled, sending vehicles plunging 80 metres into a pile of rubble in an industrial area Officials say more than 280 rescue workers and sniffer dog units are on scene At least 30 cars and three heavy trucks were caught as the bridge collapsed The busy highway connects Italy to France and vacation spots are along the route The collapse happened during a heavy rain storm