BAGHDAD (Reuters) - A suicide bomber killed 19 at a funeral in Baghdad on Sunday as an ambush halted Iraqi forces' advance on a key **rthern city controlled by Islamic State fighters. A suicide bomber killed 19 and wounded 28 others outside a Shi'ite Muslim mosque, where people were attending a funeral service, in western Baghdad, a police ******r and medical official said. "The attacker approached the entrance of the mosque and blew himself up among the crowd," the police ******r said, speaking on condition of a**nymity about the attack in the affluent neighborhood of Harthiya. ...