By Raheem Salman Baghdad (Reuters) - At least 27 people were killed in a Wave of bombings in mostly Shi'ite Muslim areas of Baghdad on Saturday, police and medics said, in the deadliest day of attacks in the capital since a Sunni insurgency overran large parts of Iraq's **rth last month. In the first explosion, a suicide car bomber drove into a police checkpoint, killing nine people including seven policemen and wounding 21 people in the Abu Dsheer district in the south of the capital, the sources said. ...