NAIROBI: Kenya police say three people were killed when a passenger bus was ambushed by gunmen suspected to be Islamic extremists in Lamu county in the country"s eastern coastal area. A police report seen by the Associated Press said Thursday that gunmen opened fire on a bus and three men were shot at close range and died instantly. It said two other passengers were wounded. In recent weeks, ahead of the New Year, Somalia"s al-Shabab rebels have stepped attacks in Kenya whose troops are in Somalia fighting the militants. The militants have vowed retribution on Kenya for its troop presence in Somalia.