In recent days, anti-government protests have engulfed Baghdad and some other cities in Iraq. Security forces have opened fire, killing dozens and wounding hundreds. A curfew has been imposed in the capital and the internet has been cut off in several regions. The United States has urged authorities to exercise restraint. As the country stands on the brink of descending once more into violence, there are fears of a return to sectarian conflict. Henry Ridgwell reports from a recent London conference on the uncertain future of Iraq.