However, Qari Yousef Ahmadi, a Taliban spokesman, told Sky News he had information that "Mullah Omar is still alive and leading the movement."
The Taliban is reportedly due to issue an official statement on Omar’s alleged death soon, according to the BBC.
Omar’s alliance with al-Qaeda leader Osama Bin Laden prompted a US-led invasion of Afghanistan in 2001 in the wake of the 9/11 attacks in New York and Washington.
Omar’s death was first reported in 2011, the same year that Bin Laden was killed in a US raid in Pakistan.
Formed in the 1990s, the Taliban seeks to enforce Sharia law in Afghanistan and Pakistan. The group is known for its numerous terrorist attacks against official personnel and civilians in both countries.