Saudi Arabia confirmed late on Saturday it sent aircraft to NATO-member Turkey’s İncirlik air base for the fight against Islamic State in Iraq and the Levant (ISIL) militants, although Turkish sources reportedly denied arrival of any Saudi aircraft.

Brig. Gen. Ahmed al-Assiri, adviser in the office of Saudi Arabia’s minister of defense, told pan-Arab Al Arabiya television that the kingdom was committed to stepping up the fighting against ISIL and that the move was part of those efforts.

He also said that the current presence in the air base was limited to aircraft and no ground troops had been sent.

“What is present now is aircraft that are part of the Saudi Arabian forces,” Assiri said in response to a question on whether ground troops were included.

Turkey’s Hürriyet daily, however, quoted Turkish military sources as denying the arrival of Saudi jets at the İncirlik air base. According to the military sources, Saudi jets had not arrived at İncirlik yet and their arrival would take two to three weeks, Hürriyet reported.

Saudi Arabia has resumed its participation in air strikes against ISIL in recent weeks and US Defense Secretary Ash Carter on Thursday welcomed its commitment to expand its role.

Turkish Foreign Minister Mevlüt Çavuşoğlu told the Yeni Şafak newspaper on Saturday that Saudi Arabia had carried out inspections at the air base in preparation for sending aircraft.