The threat came after the militant group began eighth round of peace talks with the United States, with the sides apparently closer to a deal.
The Taliban warned Afghans to boycott the upcoming vote, claiming the ultimate decision making power lies with foreigners.
“As campaigns for these theatrical elections are already in full swing and rallies are being organized, the Mujahideen of Islamic Emirate will be becoming their barrier,” the Taliban said in a statement.
The statement urged foreign nations to dedicate their energies and resources to establishing peace so that “the ongoing peace process in these critical moments is not sabotaged for a few figures.”
Afghanistan’s presidential election is scheduled for September 28. Eighteen candidates including incumbent President Ashraf Ghani have registered to run.