NAIROBI, Kenya - International pressure mounted on Kenya's leaders Wednesday to end postelection violence that has killed more than 300 people, including dozens burned alive as they sought refuge in a church. ADVERTISEMENT The killing of up to 50 ethnic Kikuyus as they sheltered in a church in the Rift Valley city of Eldoret fueled fears of deepening tribal conflict in what has been one of Africa's most stable democracies.The Kikuyu, Kenya's largest ethnic group, are accused of using their dominance of politics and business to the detriment of others. President Mwai Kibaki, who won a second term in the...