“Three jihadist groups, including one led by a key commander who has served as a senior leader in al Qaeda and the Lashkar-e-Jhangvi, have united with the Movement of the Taliban in Pakistan. The merger is part of the Movement of the Taliban in Pakistan’s efforts to rebuild itself, likely with the guidance of al Qaeda. The jihadist organization split in 2014 after a contentious leadership dispute that festered when the US killed the group’s former emir, Hakeemullah Mehsud, in a drone strike.”
Source: 3 jihadist groups merge with Movement of the Taliban in Pakistan | The Long War Journal