to territorial or internal borders. Colombian authorities announced the death of Víctor Julio Suárez Rojas, also known as Mono Jojoy, on 23 September 2010. President Juan Manuel Santos stated that the FARC commander was killed in an operation that began in the early hours of 21 September in the department of Meta, south of the capital Bogotá. According to Santos, he was "the impersonation of terror and a symbol of violence". After this event, the FARC-EP released a statement saying that defeating the group would not bring peace to Colombia and called for a negotiated solution, not surrender, to the social and political conflict. In January 2011 Juan Manuel Santos admitted that FARC-EP had killed 460 government soldiers and wounded over 2,000 in 2010. In April 2011 the Colombian congress issued a statement saying that FARC has a "strong presence" in roughly one third of the municipalities in Colombia, while their attacks have increased. Overall FARC operations, including attacks against security forces as well as kidnappings and the use of land mines, have increased every year since 2005. In the first six months of 2011 the FARC carried out an estimated 1,115 actions, which constitutes a 10% increase over the same period in 2010. By early 2011 Colombian authorities and news media reported that the FARC and the clandestine sister groups had partly shifted strategy from guerrilla warfare to "a war of militias", meaning that they were increasingly operating in civilian clothes while hiding amongst sympathizers in the civilian population. In early January 2011 the Colombian army said that the FARC has some 18,000 members, with 9,000 of those forming part of the militias. The army says it has identified at least 1,400 such militia members in the FARC strongholds of Valle del Cauca and Cauca in 2011. In June 2011 Colombian chief of staff Edgar Cely claimed that the FARC wants to "urbanize their actions", which could partly explain the increased guerrilla activity in Medellín and particularly Cali. Jeremy McDermott, co-director of Insight Crime, estimates that FARC may have some 30,000 'part-time fighters' in 2011, consisting of both armed and unarmed civilian supporters making up the rebel militia network, instead of full-time fighters wearing uniforms. According to Corporación Nuevo Arco Iris, FARC-EP killed 429 members of the Colombian government's security forces between January and October 2011. During this same period, the rebel group lost 316 of its own members.