In Tibet, the majority of Muslims are Hui people. Hatred between Tibetans and Muslims stems from events during the Muslim warlord Ma Bufang's rule in Qinghai such as Ngolok rebellions (1917–49) and the Sino-Tibetan War. Violence subsided after 1949 under Communist Party repression but reignited as strictures were relaxed. Riots broke out in March 2008 between Muslims and Tibetans over incidents such as suspected human bones in and deliberate contamination of soups served in Muslim-owned establishments and overpricing of balloons by Muslim vendors. Tibetans attacked Muslim restaurants. Fires set by Tibetans resulted in Muslim deaths and riots. The Tibetan exile community sought to suppress reports reaching the international community, fearing damage to the cause of Tibetan autonomy and fuelling Hui Muslim support of government repression of Tibetans generally. In addition, Chinese-speaking Hui have problems with Tibetan Hui (the Tibetan speaking Kache minority of Muslims). The main mosque in Lhasa was burned down by Tibetans during the unrest.