BAUCHI, Nigeria, Rajab 19, 1436, May 8, 2015, SPA -- A gunman opened fire on students after walking into a high school in Potiskum in northeast Nigeria, critically injuring six, Reuters quoted witnesses and a humanitarian aid worker as saying. The gunman, who was caught and beaten by locals, was accompanied by a suicide bomber who detonated but only blew himself up, the sources said. --SPA 14:23 LOCAL TIME 11:23 GMT www.spa.gov.sa/w