U.S. news reports say the No. 2 man in al-Qaida, Ayman al-Zawahiri, may have been the target of a Friday attack in Pakistan.
But the reports, quoting both U.S. and Pakistani officials, say it is still not known if Zawahiri was killed or injured in the attack.
Witnesses said at least two aircraft fired missiles at a village in Pakistan's Bajaur tribal area early Friday. At least 18 people were killed.
The village is on the border near Afghanistan's Kunar province, which is considered to be a stronghold of Taleban militants.
NBC news quoted U.S. officials as saying intelligence indicated a strong possibility that Zawahiri was in the village at the time of the attack. But this has not been confirmed.
The U.S. has offered a $25-million reward for the capture of Zawahiri, who is believed to serve as the advisor and doctor to Osama bin Laden.
Some information for this report provided by ABC and Reuters.