Fire has destroyed much of the Kasubi Tombs in Uganda, the final resting place of royalty and a UNESCO World Heritage Site dating back 150 years, police said Wednesday. The cause of the blaze which started early Tuesday night and which consumed the thatched-roof mausoleum and many royal artifacts of the Bugandan kingdom has not been identified. The Baganda are Uganda's largest tribe and were instrumental in Ugandan President Yoweri Museveni coming to power 24 years ago. Museveni based his five-year military struggle in the kingdom's heartland and support by the Baganda helped him stay in power. A kingdom official, Charles Peter Mayiga, said the gutted mausoleum was built in 1860 by Kabaka Mutesa I and that its historical and cultural significance was an object of deep reverence by the Baganda.