Police troopers man a checkpoint on a road after a ceasefire between Shi’ite Muslim Houthis and Sunni Salafis took effect in the north-western Yemeni province of Saada January 11, 2014. Fighting in north Yemen between Shi’ite Muslim Houthis and Sunni Salafis stopped on Saturday as a ceasefire deal took effect, according to a presidential committee trying to help end the conflict. REUTERS/Stringer (YEMEN – Tags: POLITICS CIVIL UNREST MILITARY)