Ministers from Burundi's leading Tutsi parties have boycotted a cabinet meeting called to discuss the drafting of a new constitution. Last month, the Uprona party and its nine allies refused to sign a South African-brokered power-sharing deal, to form the basis of the constitution. They want further dialogue about power-sharing between Hutus and Tutsis, who make up 15% of the population. Without a new constitution, elections due by 31 October cannot go ahead.