The United States on Thursday shot down a Turkish drone operating near its troops in Syria, said a US official. It is the first time that Washington has announced that it shot down an aircraft of Turkey’s NATO ally.

Turkish Defense Ministry official stated that the drone shot down by the US-led coalition did not belong to the Turkish armed forces, but he did not say whose property it was.

Two US officials, speaking on condition of anonymity, said an F-16 shot down the Turkish drone after the United States repeatedly warned Turkish military officials that it was operating near US ground forces.

A US official said the Turkish drone was reportedly armed.

The Syrian Observatory for Human Rights and a local security source said the US-led coalition shot down a Turkish drone near a base in northeastern Syria.

Syrian Kurdish forces allied with the US said the Turkish attacks killed eight people in an escalation triggered by a bombing in Ankara claimed by Kurdish militants.

US support for Kurdish forces in northern Syria has long caused tension with NATO ally Turkey, which views them as a wing of the outlawed Kurdistan Workers’ Party (PKK).