Presidential candidate Abdullah Abdullah claimed victory on Tuesday in Afghanistan's disputed election, blaming fraud for putting him behind poll rival Ashraf Ghani in preliminary results.
"We are proud, we respect the votes of the people, we were the winner," Abdullah told thousands of cheering supporters gathered in Kabul.
A suicide bomber struck the convoy of Abdullah Abdullah, the front-runner in the first round of Afghanistan's presidential election, near the capital Kabul.
Four civilians were killed in the explosion and some of Abdullah's guards were wounded, but the candidate himself has no injuries, as Al-Jazeera English reports citing a televised statement he made shortly after the incident.
Taliban insurgents threatened Monday to attack Afghanistan's run-off presidential election, warning voters to stay away from polling stations for fear of injury or death.
Afghans are due to go to the polls on June 14 to choose whether Ashraf Ghani or Abdullah Abdullah should succeed President Hamid Karzai.