A top al-Qaeda operative, indicted for the 1998 US embassy bombings in Africa, is believed to have been killed in a Pakistani military strike on Wednesday.
US authorities had posted a $5m (£2.9m) bounty
Egyptian-born explosives expert Mohsin Musa Mutawalli Atwah is thought to be among seven militants killed in the raid near the Afghan border.
A top Pakistani official confirmed the death to the BBC citing military sources but this has not been verified.
More than 220 people died in the US embassy attacks in Kenya and Tanzania.
Helicopter gunships are said to have carried out the raid targeting foreign militants in Anghar town, about six kilometres south of Miranshah, in North Waziristan.
Pakistani Information Minister Sheikh Rashid Ahmed told the BBC that the military has confirmed the death of Atwar, however this has not as yet been corroborated.
There are unconfirmed reports of civilians among the dead. Pakistan army spokesman General Shaukat Sultan said he did not have details on the casualties.
The US authorities had posted a $5m (£2.9m) reward for Atwah, who goes under a number of aliases, including Abdul Rahman Al-Muhajir and Mohammed K.A. Al-Namer.
According to a US list of terrorist suspects, he was involved in multiple operations and may have knowledge of chemical, biological, radiological or nuclear attacks.
Atwar is also said to be a close associate of former al-Qaeda operations chief Hamza Rabia, who was killed in an explosion in the same region in 2005.