Twenty-one people have been killed and at least 100 others injured by three bomb explosions in southwest Baghdad, Iraqi officials say.<br /><br />There was no immediate claim of responsibility for the blasts, but armed anti-government groups like al-Qaeda in Iraq generally tend to target Shia mosques and neighbourhoods.<br /><br />Violence in Iraq has fallen dramatically since peaking in 2006 and 2007, but attacks have surged in recent months, especially against officials, government institutions and security forces.<br /><br />Al Jazeera's Rawya Rageh reports from Baghdad
