The second-place finisher in the first round of Guinea-Bissau's presidential election says he will not participate in the runoff, calling the process fraudulent.
Provisional results put Kumba Yala in second with 23 percent after ex-prime minister Carlos Gomes Jr., who got nearly 49 percent among the nine candidates competing in Sunday's poll.
Electoral law calls for a runoff between the top two finishers if none of the candidates received more than 50 percent.
Yala, a former president who was overthrown in a 2003 coup, told reporters Thursday: "I will not compete in a second round, or even a third round of the election because these elections are fraudulent."
The election was marred hours after polls closed by the murder of the former chief of intelligence by gunmen near his home. Guinea-Bissau has weathered countless coups since independence from Portugal in 1974.