The Latest: Activists: Syria airstrikes kill 17, mostly kids

Turkey's state-run news agency says a helicopter believed to belong to Syrian government forces has dropped barrel bombs in a deadly attack on Turkey-backed opposition forces in the border area.

The Anadolu Agency, quoting military officials, reported on Wednesday that two opposition fighters were killed in the attack in the village of Tall Nayif in northern Syria while five others were wounded.

Turkey says the Kurdish forces are linked to Turkey's outlawed Kurdish insurgents and the Turkish government considers both to be terrorist groups.