The Taliban on Saturday called on Afghans to boycott next month's presidential election run-off and vowed to disrupt voting in a repeat of their threat to derail the disputed first round. "The Islamic Emirate of Afghanistan once again urges their respected countrymen not to participate," the Taliban said in a statement, emailed to Reuters, saying the election process was being orchestrated by Washington. "In order to make this process fail all the mujahideens will carry out operations on the enemy's centres," it said of the thousands of polling stations to be set up for the Nov. 7 vote between President Hamid Karzai and challenger Abdullah Abdullah.