Iraqi troops launched an operation in several places, including in the south of Baghdad and Tikrit.
A spokesman for the Islamic militant group ISIS announced that they unite the territories under their control in Iraq and Syria into one Caliphate.
Abu Muhammad al-Adnani said on Sunday (29/06) through its website and Twitter that this Caliphate in all aspects of life will be governed in accordance with Islamic law.
The caliphate covers an area of Aleppo in northern Syria to Diyala in eastern Iraq.
ISIS spokesman said these developments make them change the name of ISIS, which means Islamic State of Iraq and the Levant, into an "Islamic State" course.
The group also said it had appointed their leader, Abu Bakr al-Baghdadi as the caliph, who is said to be the leader of all Muslims.
"He is a priest and for every Muslim caliph (around the world)," said Al-Adnani.
Establishment of Islamic Caliphate announced after ISIS seize some territory in Iraq.
ISIS-Sunni militant groups have the same line with the ideology of al-Qaeda but reinforced by foreign fighters from outside Iraq.
Charles Lister, an analyst at the Brookings Doha Center institute study, assessing the announcement as an important development.
"Regardless of the question of legitimacy, the announcement of the establishment of the Caliphate is the most significant development of international jihadism since the Sept. 11," said Lister was quoted as saying by Reuters news agency.
Clashes reportedly broke out again between the Sunni-led insurgents and government forces around the town of Tikrit, Iraq.
Witnesses said a wave of air strikes and the former palaces of former President Saddam Hussein became a target of attack.
A source in Iraq told the BBC that the rebels captured several places near the military base.
They reportedly seized several parts of northern military base Speicher in Tikrit despite being attacked by government helicopters.
This development comes a day after the Islamic State of Iraq and the Levant (ISIS) announced "Caliphate" to unify the areas they captured in Iraq and Syria.
In a related development, the Iraqi military has denied reports that the rebels beat back a convoy of government troops were deployed to assist.
Tikrit captured leaders of militant groups ISIS on June 11 when they controlled much of northern and western Iraq.
Since the fighting broke out between militants and government troops.
On Friday, the army seized most of Tikrit University campus.
Attacks launched on Saturday getting fierce resistance from the militants and government troops pulled back into town Dijla. BBC
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