Pro-Russian forces in Chechnya say they have killed a rebel commander close to Chechen separatist leader Doku Umarov. Chechen Interior Minister General Ruslan Alkhanov said Musa Mutiyev, known as "the emir of Grozny," was killed on September 8 in a special operation in Grozny.The minister said Mutiyev was wanted by authorities for his involvement in a series of murders and other serious crimes. The minister added that Mutiyev was close to Umarov and had also collaborated with slain militant Rustam Basayev.