The YPG-controlled neighborhood of Sheikh Maqsood in Aleppo have been under constant siege by both Syrian government forces and the rebels for more than a year. In September 2015 the Army of Victory accused the YPG of having a border crossing with the regime, while the YPG accused the Victory Army of shelling the neighborhood. The conflict between Fatah Halab and the SDF in Aleppo escalated in November as Ahrar ash-Sham, Liwa Ahrar Souriya, and the Mountain Hawks Brigade battled the YPG and the FSA-SDF group Army of Revolutionaries for control of the village of Maryamin. In late November 2015, there were clashes between the Army of Revolutionaries, supported by the YPG, and the FSA-dominated Mare' Operations Room in the northern Aleppo Governorate, backed by Ahrar ash-Sham and the al-Nusra Front. However, both the YPG and al-Nusra denied involvement in the conflict. In December the government of the Afrin Canton declared a state of emergency due to threats of attacks from Ahrar ash-Sham and al-Nusra Front and increased cooperation with Jaysh al-Thuwar. On 3 December 2015, a truce was signed between the YPG and the Mare' Operations Room in Aleppo, although the Army of Revolutionaries refused to recognize the treaty and announced that they will continue to fight the rebels. However, another agreement was signed between the Mare' Operations Room and Jaysh al-Thuwar on 19 December 2015, which permitted Jaysh al-Thuwar to join the operations room. Clashes between the SDF and the rebels erupted again in February 2016 when the YPG and the Army of Revolutionaries followed the offensives of the Syrian Armed Forces, backed by Russian air strikes. The SDF then captured the villages of al-Ziyara and Khuraybika from Islamist rebels, reportedly with the support of the locals. The YPG and YPJ later seized the Menagh Military Airbase. The next day, Turkey retaliated by shelling the air base and other Kurdish forces in Afrin. The United States subsequently condemned both the shelling and the advances made by the YPG, although both groups continued their attacks. Since then, the 13th Division of the FSA have joined the fight against the SDF in Kaljibrin, Azaz District, who they all label as "PKK". In March 2016 the Turkish-backed and US-armed Kurdish FSA group Grandsons of Saladin, supported by Turkish shelling, captured several villages between Jarabulus and Azaz from ISIL and threatened to attack the YPG, accusing them of working with the regime.