Dec. 7 (Bloomberg) -- Democratic Republic of Congo President Joseph Kabila looked set to extend his 10-year rule as the U.S. joined other governments warning that the mineral-rich country’s election results may trigger violence.

Kabila leads his main rival, Etienne Tshisekedi, 49 percent to 33 percent with 89 percent of polling stations reporting, Daniel Ngoy Mulunda, the head of the electoral commission, told reporters in Kinshasa, the capital, yesterday.