BAMAKO (Reuters) - A car bomb exploded in the remote northern Malian town of Kidal on Tuesday, Mali's army said, the second attack there in less than a week as Islamist rebels step up a guerrilla campaign. French forces have been stationed in Kidal since driving out al Qaeda-linked fighters late last month as part of an intervention against the Islamist militants who had seized the northern two-thirds of the West African country. ...