Violent clashes broke out between militants of the so-called Islamic State in Iraq and Levant (ISIL) and Storm of North Brigade gunmen of the Free Syria Army in the rural town of Azaz on the border with Turkey.

Violent clashes broke out between militants of the so-called Islamic State in Iraq and Levant (ISIL) and Storm of North Brigade gunmen of the Free Syria Army in the rural town of Azaz on the border with Turkey.

The UK-based opposition Syrian Observatory reported that "ISIL militants are moving towards the headquarters and checkpoints of Storm of North Brigade near the Bab al-Salamah border crossing in the north of country.

"They are also moving towards villages in the city countryside that witnessed some displacements," the same sources said.

Revival of battles was not surprising, especially that the agreement signed two weeks ago between both parties maintains the ISIL's control over sites it had earlier occupied in Aazaz, and the organization still keeps on arresting Storm of North militants.

Moreover, media war between both sides also constitutes a cornerstone, as Storm of North warned ISIL of turning Aazaz into a cemetery for the latter's gunmen, accusing the organization of disloyalty in many areas, in reference to the ISIL militiamen who stormed headquarters of the so-called Ahfad Al-Rasool Brigade in Raqqa and Deir Ezzor.

ISIL spokesman, Mohammad Adnan al-Shami, slammed what he called unjust campaign to discredit his organization, accusing Storm of North of receiving western support.

For their part, other armed terrorist groups - such as the Free of Levant Movement, Hawks of Syria Brigades, Army of Islam, Tawhid Brigade, Forqan Brigades and Haq Brigade - have called upon the ISIL and Storm of North Brigade "for an immediate cease-fire" between both of them in the area of Azaz.

In a joint statement, the opposition armed groups also called on ISIL to withdraw forces towards the areas where they were stationed before the outbreak of clashes between the two sides.

Developments in Aazaz haven't obscured the fierce battles between ISIL and Al-Nusra Front on one side, and the Kurdish militants on the other.

Kurdish media sources revealed that  violent battles erupted between the two sides in Tal Half of Ras al-Ein city surroundings, in addition to military confrontations that took place in Aleppo city and countryside.

Recently, fierce clashes erupted between the ISIL, Al-Qaeda-affiliated Al-Nusra Front terrorist group and the so-called free Syrian army in the wake of disputes on power and control sharing over areas not reclaimed so far by the Syrian army.

The Syrian national military launched a wide-scale military operation in May 2013 in the country's main provinces to restore security and release citizens from terrorist threats.

Syria was hit by a violent unrest since mid-March 2011, where the Syrian government accuses foreign actors of orchestrating the conflict by supporting the militant opposition groups with arms and money.