Gangs armed with machetes and bows and arrows burned and hacked to death members of a rival tribe in western Kenya Sunday, as the number of dead from the latest explosion of violence over disputed presidential elections rose to 69. Houses were blazing in the tourist gateway town of Naivasha, torched by members of President Mwai Kibaki's tribe exacting revenge on their Luo rivals... The latest deaths raise the toll to nearly 800 killed in ethnic violence and clashes with police since Kibaki was declared winner of Dec. 27 balloting that international and local observers say had a rigged tally....