ABIDJAN (AFP) - More gunfire shook Ivory Coast's main city Thursday but Laurent Gbagbo remained holed up in his bunker, protected by about 200 men after clashes that forced the dramatic rescue of Japan's envoy. Bodies lay in the streets of Abidjan days into a military offensive to force Gbagbo to give up the presidency, with food stocks running low, water and power supplies erratic and security plummeting, witnesses said. Residents hid in their homes in the Cocody suburb where the strongman was still hunkered down in the presidential residence after forces from internationally recognised president Alassane Ouattara failed to remove him Wednesday. "This morning we are hearing strong explosions and firing," a resident told AFP from the northern area as armoured vehicles carrying French and UN soldiers patrolled the Plateau suburb, where the presidential palace is based. UN Secretary General Ban Ki-moon urged Gbagbo to quit power before it was "too late", warning that he was facing his last chance for a "graceful" exit. "It is absolutely necessary at this time that, before too late, he has to cede his power to the democratically elected leader, Mr Ouattara," Ban said, adding: "It is his last opportunity to gracefully exit from this."