DERA ISMAIL KHAN - Pakistan's Taliban have rejected Islamic State leader Abu Bakr al-Baghdadi's claim to be the global leader of all Muslims, the movement said in a statement seen by Reuters on Saturday. The Tehrik-e-Taliban Pakistan statement comes after a similar rejection by the Afghan Taliban following pledges of allegiance from low-level commanders of both movements to the Middle East-based Islamic State (IS).

Last year, IS, an Al-Qaeda offshoot, proclaimed its leader as "caliph" - the head of the state. Al-Baghdadi aspires to establish a global caliphate with himself at its head.

The latest TTP statement comes amid speculation that the movement's leadership, whose goal is to topple the government of Prime Minister Nawaz Sharif and set up a sharia state, is actually wary of IS, which is driven by different ambitions that have little to do with South Asia. "Baghdadi is not Khalifa (caliph) because in Islam, Khalifa means that he has command over all the Muslim world, while Baghdadi has no such command; he has command over a specific people and territory," the Taliban said in the statement.

"Baghdadi is not a Khalifa because his selection is not according to Islamic rules," the statement said, adding that the IS leader had little control in Muslim countries like Egypt, Libya, Yemen and Afghanistan.

Pakistani authorities say IS has no financial ties with any Pakistani group. But there are concerns about further turmoil in the region as US-led foreign troops withdraw from Afghanistan, with groups like the Haqqani network and IS likely to exploit the security vacuum.

The entry of Islamic State, while its numbers remain small, will also complicate Pakistan's fight against indigenous militants fighting to overthrow the government.

In its latest statement, the Pakistani Taliban also condemned the 'barbarity' of Islamic State's rule.

"Baghdadi's caliphate is not Islamic because in a real caliphate you provide real justice while Baghdadi's men kill many innocent mujahideen (fighters) of other groups," the statement said.

Earlier this year, the Afghan Taliban sent a letter to al-Baghdadi to stop recruiting in Afghanistan, saying there is room for only "one flag, one leadership" in their fight to re-establish strict Islamist rule.