THE AL-QAEDA BREAKAWAY group that has seized much of northeastern Syria and huge tracts of neighbouring Iraq, ISIS, formally declared the establishment of a new Islamic state and demanded allegiance from Muslims worldwide.

With brutal efficiency, the Sunni extremist group has carved out a large chunk of territory that has effectively erased the border between Iraq and Syria and laid the foundations of its proto-state.

But the declaration, made on the first day of the Muslim holy month of Ramadan, could trigger a wave of infighting among the Sunni militant factions that formed a loose alliance in the blitz across Iraq and impact the broader international jihadist movement, especially the future of al-Qaeda.

The spokesman for the Islamic State of Iraq and Syria declared the group’s chief, Abu Bakr al-Baghdadi, as the leader of the new caliphate, or Islamic state, and called on Muslims everywhere, not just those in areas under the organization’s control, to swear loyalty to al-Baghdadi and support him.

“The legality of all emirates, groups, states and organizations becomes null by the expansion of the caliph’s authority and the arrival of its troops to their areas,” said the spokesman, Abu Mohammed al-Adnani, in an audio statement posted online.

Listen to your caliph and obey him. Support your state, which grows every day.

Al-Adnani loosely defined the Islamic state’s territory as running from northern Syria to the Iraqi province of Diyala — a vast stretch of land straddling the border that is already largely under the Islamic State’s control. He also said that with the establishment of the caliphate, the group was changing its name to just the Islamic State, dropping the mention of Iraq and the Levant.

Muslim extremists have long dreamed of recreating the Islamic state, or caliphate, that ruled over the Middle East, much of North Africa and beyond in various forms over the course of Islam’s 1,400-year history.

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