A car bomb exploded at a military checkpoint near Somalia's presidential palace in the capital, killing at least six people. According to the spokesman for Mogadishu's mayor, the dead included a soldier and five civilians. Another dozen people were injured. The blast was detonated after soldiers tried to stop the car and the bomber tried to speed through the checkpoint.'<br/>'<br/>The blast came a few hours after Somalia's new prime minister unveiled a 26-member cabinet, the latest step as the fragile central government tries to further assert itself beyond the capital.<br/>'<br/>There was no immediate claim of responsibility, but extremist group al-Shabab often claims deadly bombings in Mogadishu.