MAIDUGURI, Nigeria (Reuters) - Suspected Boko Haram gunmen killed four people on Sunday in a road ambush in Nigeria's restive northeastern state of Borno, a military source and a civilian joint task force said. A car carrying six people came under attack on the Damboa-Biu road near the remote village of Nwajurko at about 9:30 a.m. (0830 GMT), the military source said. The militant group, which has killed thousands of people during its six-year armed campaign to set up an Islamic state in northeastern Nigeria... More