Two aircraft, believed to be US Army helicopters, were spotted flying over the Syrian city of Manbij on Friday shortly after Reuters cited the main Turkey-backed Syrian rebel force as saying that its convoys, along with Turkish forces, were heading towards the frontlines with the northern city, in "full readiness… to start military operations" to liberate it.
Another video shows the Turkish military entering the Syrian border town of Jarablus, Aleppo province.
Earlier this week, Damascus announced the deployment of troops to the city after the Kurdish People's Protection Units (YPG) called on the government to take control of Manbij as Turkish President Recep Tayyip Erdogan announced that Turkey was ready to kick off a military operation in the area.
Erdogan brushed off the reports on Manbij passing under the Syrian government's control as a "psychological operation", saying that the situation in the region remained "indefinite".
While the situation around Manbij escalated after US President Donald Trump announced the withdrawal of US troops from Syria, Ankara has long been threatening to launch an offensive against the YPG, which it considers to be affiliated with the Kurdistan Workers' Party (PKK), listed as a terrorist organisation by Turkey.