Dreaded Islamic State militant group has appointed a breakaway Taliban commander as its chief in Khurasan, a historic name used by militants for an area covering Afghanistan, Pakistan and parts of India.
Tehreek-i-Taliban Pakistan's six top commanders on Tuesday pledged allegiance to the Islamic State leader Abu Bakr al-Baghdadi, who has been vying for supremacy with Al Qaeda chief Ayman al-Zawahiri.
