A rebel leader involved in organizing a deadly attack by a female suicide bomber in the Russian republic of Dagestan has been gunned down, officials said. A leader of the "Caspian" group identified as Zaur Sheikhmagomedov was killed in the provincial capital of Makhachkala, after he opened fire on police officers, a representative of Dagestan's Interior Ministry said.Anti-terrorism officials said that Sheikhmagomedov organized a deadly attack by a female suicide bomber earlier this year.The rebel was "directly" involved in the planning of the May 25 attack in Machachkala, when a young woman named Madina Aliyeva blew herself up killing one and wounding at least 14 people, including two children and five police officers, according to a statement by the National Anti-Terrorism Committee.