Since late 2011, Kenya has seen an upsurge in violent terrorist attacks. Kenyan government officials asserted that many of the murders and blasts were carried out by Al-Shabaab in retaliation for Operation Linda Nchi, a coordinated military mission between the Somalian military and Kenyan military that began in October 2011, when troops from Kenya crossed the border into the conflict zones of southern Somalia. According to Kenyan security experts, the bulk of the attacks were increasingly carried out by radicalized Kenyan youth who were hired for the purpose. Kenya security officials also indicated that they were part of death squads, which carried out many of the killings under the orders of a government security council. By mid-2014, the cumulative attacks began affecting Kenya's tourism