By Saif Hameed BAGHDAD (Reuters) - Iraq's prime minister fired three officials in charge of Baghdad's security on Friday after last weekend's bombing that killed nearly 300 people and caused public outrage over the inadequacy of the emergency services and security apparatus. The bombing, claimed by the ultra-hardline Sunni militant group Islamic State (IS), was the deadliest in Iraq since U.S.-led forces toppled Saddam Hussein 13 years ago. Islamic State has lost ground since last year to U.S.-backed government forces and Iranian-backed Shi'ite Muslim militias advancing into territories they control in northern and western Iraq, but IS retains the ability to strike the heart of Baghdad.
