ABDI SHEIKH and FEISAL OMAR A suspected suicide car bomb exploded on Sunday in Somalia's capital and was followed by a shootout between militants and security forces at a hotel, causing an unknown number of casualties, witnesses and authorities said. The militant Islamist group al Shabaab, which is linked to al Qaeda and often carries out bombings in its war on Somalia's government, claimed responsibility via its radio station. "A speeding car exploded near the hotel and checkpoint. The blast shook us and heavy gunfire followed," shopkeeper Ali Abdulahi told Reuters of the incident in the busy Kilometre 4 area…