Mullah Omar has not been seen since 2001 when he fled after US-led forces pushed the Taliban out of power in Afghanistan.

In January, Afghan authorities released a videotape of a captured alleged Taliban spokesman in which he said that Mullah Omar was living in Quetta under the protection of the Pakistani security services.

Islamabad has denied hiding the Taliban leader and repeatedly says it is working to stop the group from operating in southwestern Pakistan.

Hundreds of thousands of Afghan refugees live in the province making it easy for Taliban members to hide among them.