A Kenyan policeman talks to children, crossing from Somalia to Kenya, in the border town of Mandera, December 5, 2014. Somali al Shabaab Islamist militants killed 36 non-Muslim workers at a quarry in Mandera, northeast Kenya on Tuesday, prompting the president to sweep out his top security officials in order to tackle a relentless wave of violence. Picture taken on December 5, 2014. REUTERS/Goran Tomasevic (KENYA - Tags: CIVIL UNREST SOCIETY)