Turkey says barrel bombs have hit Syrian opposition fighters

In this photo provided by the Syrian Civil Defense group known as the White Helmets, Syrian Civil Defense workers search through the rubble after airstrikes in the village of Hass in the Idlib province, Syria, Wednesday, Oct. 26, 2016. Syrian activists say that airstrikes outside a school in the northern, rebel-held province of Idlib have killed more than a dozen people, mostly children. The Idlib News network says the airstrikes hit as the children gathered outside a school complex in the village of Hass. (Syrian Civil Defense White Helmets via AP) (The Associated Press)

In this photo provided by the Syrian Civil Defense group known as the White Helmets, Syrian Civil Defense workers search through the rubble after airstrikes in the village of Hass in the Idlib province, Syria, Wednesday, Oct. 26, 2016. Syrian activists say that airstrikes outside a school in the northern, rebel-held province of Idlib have killed 17 people, mostly children. The Idlib News network says the airstrikes hit as the children gathered outside a school complex in the village of Hass. (Syrian Civil Defense White Helmets via AP) (The Associated Press)

In this photo provided by the Syrian Civil Defense group known as the White Helmets, Syrians inspecting damaged buildings after airstrikes in the village of Hass in the Idlib province, Syria, Wednesday, Oct. 26, 2016. Syrian activists say that airstrikes outside a school in the northern, rebel-held province of Idlib have killed more than a dozen people, mostly children. The Idlib News network says the airstrikes hit as the children gathered outside a school complex in the village of Hass. (Syrian Civil Defense White Helmets via AP) (The Associated Press)

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. The agency didn't say when the attack happened.

Turkey sent troops and tanks into Syria in August to support Syrian opposition forces efforts to clear the border area of Islamic State fighters.

Ankara is also seeking to contain the U.S.-backed Syrian Kurdish forces fighting IS. Turkey says the Kurdish forces are linked to Turkey's outlawed Kurdish insurgents and the Turkish government considers both to be terrorist groups.