Al Qaeda reportedly back in Afghanistan, plotting new attacks against West - Taliban leader Mansour killed in US strike, Afghan intel agency says - VIDEO: US officials say Taliban leader Mullah Mansour 'likely' killed

Al Qaeda has returned to its longtime base of operations in southern Afghanistan and is plotting new attacks against the West, fifteen years after being overrun by U.S.-led NATO forces following the 9/11 attacks, according to a published report. Britain's Daily Telegraph, citing Afghan security officials, reported Monday that Al Qaeda cells have moved back into southern Afghanistan following the withdrawal of most U.S. and allied troops in 2014. The report claimed that most of the cells are operating around the southern Afghan city of Kandahar, the spiritual home of the Taliban. The Telegraph reports that security officials believe that Al Qaeda's return to Afghanistan is the latest move to re-establish its strength after the killing of Usama bin Laden by Navy SEALs in 2011 and the rise of ISIS, a former Al Qaeda splinter group. The report comes days after a U.S. drone strike killed Afghan Taliban leader Mullah Mohammed Akhtar Mansour.