How Colonel Muammar Gaddafi's power collapsed in Libya

Libya's ex-leader Col Muammar Gaddafi has been killed after an assault on his birthplace of Sirte, officials say.

Acting Prime Minister Mahmoud Jibril announced the death, which has led to thousands of people rejoicing in the streets across Libya.

Jeremy Bowen explains how Colonel Muammar Gaddafi's power collapsed in Libya in the wake of the Arab Spring.