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This undated photo obtained July 30, 2015 courtesy of the US State Department shows Mullah Omar. Mullah Omar's death poses an existential crisis for the Afghan Taliban, analysts say, potentially presaging a splintering of the movement as the Islamic State group gains a toehold among insurgents enthralled by its battlefield prowess. The group has suffered a string of recent defections to IS, with some insurgents voicing disaffection with the "ghost leader", who hasn't been seen in public since the 2001 US-led invasion toppled the Afghan Taliban from power. The July 30, 2015 confirmation of Omar's death will inevitably deepen divisions, observers say, triggering a power struggle within the already fractious movement at a time when IS is making gradual inroads into Afghanistan. AFP PHOTO/US STATE DEPARTMENT/HANDOUT = RESTRICTED TO EDITORIAL USE / MANDATORY CREDIT: "AFP PHOTO HANDOUT-US STATE DEPARTMENT"/ NO MARKETING - NO ADVERTISING CAMPAIGNS / DISTRIBUTED AS A SERVICE TO CLIENTS=