Intelligence sources in Pakistan say Pakistani Taliban leader Hakimullah Mehsud was wounded in a suspected U.S. drone attack Thursday.
The sources, who did not want to be named, said the attack targeted a militant training camp in the South Waziristan region.
There were conflicting accounts about Mehsud's status from the Taliban itself. Some sources within the militant group confirmed the reports that he was wounded and said he was receiving medical treatment.
Other Taliban sources released an audiotape purporting to be of Mehsud's voice, in which he says he is alive. The tape, however, does not mention a date or the drone attack.
At least 12 alleged militants were killed in Thursday's strike.
Security officials say another U.S. drone attack Friday killed three militants in the North Waziristan tribal region of Pakistan, near the Afghan border.
Attacks using the pilotless drones have increased in Afghanistan and Pakistan since a suicide bomber killed seven U.S. intelligence agents in eastern Afghanistan last month.