ISLAMABAD, Feb. 24 (Xinhua) -- Unidentified gunmen shot dead senior Pakistani Taliban leader Asmatullah Shaheen Bhittani on Monday in North Waziristan tribal region in norwest Pakistan, security officials said.
Shaheen was nominated interim leader after the killing of the Taliban chief, Hakimullah Mehsud, in a U.S. drone strike in November 2013.
No group has claimed responsibility for the assassination of the top commander of the Tehrik-e-Taliban Pakistan.
Officials in the region said that Shaheen's vehicle came under fire from gunmen in a car. His three guards were also killed in the attack in Dargah Mandi area near Afghan border.
Shaheen's killing is seen as another serious setback for the Taliban as they have lost second top commander in less than four months.
He was known for several major attacks on the security forces in Waziristan region. Some Taliban sources say he was one of those Taliban leaders who had supported peace talks with the government.
Shaeen was believed to be a former active member of a banned group "Harkatullah Mujahideen" which fought against the Indian troops in Kashmir.