As elsewhere in the North Caucasus, the brutality of state security forces has been a major factor, driving young men to join the Islamists. Under the presidency of the former KGB officer, Murat Zyazikov, teams of masked operatives kidnapped, tortured and killed suspected rebels and members of their families. Zyazikov's successor, Yunus-bek Yevkurov, appointed in 2008, had success in dampening the violence, although he was seriously injured in a suicide bombing by the militants during his first year in office.