A Sudanese opposition party official says one of its top leaders died in a car crash on a highway outside the capital. Wathig al-Breir says the secretary general of the Umma Party, Abdel Nabi Ahmed, 58, was driving with his two sons south of the capital when the accident occurred. The sons survived. Ahmed is originally from the strife-torn Darfur region. His death Saturday comes at a critical time for the opposition ahead of the 2009 elections. Umma Party leader Sadiq al-Mahdi was the last democratically elected prime minister. He was unseated in 1989 by the current President Omar al-Bashir in a military coup. The funeral is to be held Sunday.