Members of the Kisii tribe prepare to fight a battle with the Kalenjin tribe in the town of Chepilat, west of Nairobi, February 3, 2008. Gangs of youths from rival ethnic groups armed with clubs, bows and machetes clashed in Kenya's Rift Valley on Sunday, shouting war cries, firing salvos of arrows and pelting each other with rocks. REUTERS/Peter Andrews (KENYA)