Turkish soldiers

Turkey's military said the soldiers had been targeted in a Syrian government air strike on Thursday, during an offensive by Turkish-backed rebels against so-called Islamic State.

However, a Syrian monitoring group said the deaths were caused by a suicide bomb attack on Wednesday claimed by IS.

Meanwhile a member of the US military has died while fighting against IS.

The soldier, who has not been named, died from wounds caused by an improvised explosive device in Ayn Issa, north of the IS stronghold Raqqa.

Another five soldiers were wounded in a rocket attack on Turkish tanks, the military said in a statement.

The fatalities are believed to be the first since Turkey launched its operation inside Syria two weeks ago.

Two fighters from the Free Syrian Army were also killed and another two injured in the attack.

"Two of our hero comrades were martyred and five were wounded in a rocket attack on two of our tanks by Daesh (IS) elements," the army statement said.

The rocket attack was launched near the village of al-Waqf, it added.