There are fresh claims that the Pakistani Taliban chief Hakimullah Mehsud is dead, after state TV reported that he had been buried.
But within hours of the report the Taliban again denied Mehsud had been killed and challenged reporters to provide proof of it.
Pakistan's army said it could not confirm the death and said its agents were seeking clarification.
Reports of Mehsud's death first began after a drone strike on 14 January.
US drones have mounted numerous missile strikes in recent years, and killed the Taliban's former leader, Baitullah Mehsud, last August.
North and South Waziristan - where the Mehsud tribe comes from - are major sanctuaries for militants.
The army launched an offensive against the militants in South Waziristan in October and is under US pressure to do the same in North Waziristan.
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