 Complete the following phrase:  The continued upsurge of violence in Dagestan since 2008 included the killing of Gen. Valery Lipinsky, the first deputy head of the Internal Troops in the North Caucasus; the sniper assassination of Dagestans Interior Minister, Gen. Adilgerei Magomedtagirov; and the massacre of four policemen and seven alleged prostitutes at a bathhouse in Makhachkala. In 2009, at least 58 police officers were killed in Dagestan. The Vilayat Dagestan was responsible for a suicide attack on 6 January 2010 that killed six policemen; 