Said Bahaji remains at large
Pakistan's army says it has found in South Waziristan the passport of a man linked to two hijackers involved in the 11 September 2001 attacks in the US.
The passport of Said Bahaji, a German of Moroccan origin, was among weapons, documents and jihadi literature seized by troops in the conflict zone.
The army showed the document to a group of reporters during a trip to the area.
The BBC's Orla Guerin says there is no way of knowing if this passport is a genuine document.
Our correspondent was part of a team of journalists who were taken to South Waziristan by the military.
The passport was presented on a table with other documentation but there was no independent way of verifying its authenticity, our correspondent says.
Pakistan's army is carrying out a major offensive in the area against the Taliban and al-Qaeda militants and the region is generally out of bounds for journalists.
Said Bahaji is suspected to be a member of the Hamburg cell which planned the 9/11 attacks.
He is believed to have been a close associate of Mohammad Atta, the leader of 9/11 hijackers.
He fled Germany shortly before the attacks and remains at large.
Mr Bahaji has been charged in his absence in connection with several thousand murders committed in the attacks.
Correspondents says if the document is authentic, this will be the first time a direct link can be established between the Taliban in South Waziristan and a suspect in the 9/11 attacks.