The statement threatens to further complicate efforts to bring both sides to the table. The push for negotiations got off to a rocky start after the Taliban opened the new office last week with great fanfare on live television, hoisting the flag it used when it ruled Afghanistan and calling the bureau an office of the "Islamic Emirate of Afghanistan."
Both the sign and flag have since been taken down. But Taliban spokesman Suhail Shaheen said in a statement that reports his office had agreed to remove them were "baseless and fabricated."
Shaheen said the Taliban's stance hadn't changed on the use of both, though he did not say whether the group planned on trying to put them back up.
Meanwhile, the main US envoy trying to spearhead the talks, James Dobbins, was to have talks in Kabul today with Karzai and others following meetings with Qatari officials the day before.
Both US and Taliban officials say the two sides have not directly talked with one another.