Turkey has issued an arrest warrant for a Syrian Kurdish leader over a deadly bombing in Ankara.

The warrant named Salih Muslim of the Syrian Kurdish Democratic Union Party (PYD) and nearly 50 other people.

The PYD is affiliated with YPG Kurdish militias, who are backed by the US in the fight against jihadist group Islamic State (IS) in Syria.

Turkey has blamed the PYD and the YPG for the bombing of a military convoy in Ankara in which 28 people died.

Both groups have rejected claims that they had any involvement in the February attack.

The US has also cast doubt on the Turkish allegation, and a dispute over the two groups' role in Syria has strained relations between Washington and Ankara.

Turkey has long insisted that Syrian Kurdish militants are an extension of the outlawed Kurdistan Workers' Party (PKK), which has carried out an insurgency in the south-east of Turkey for decades.

The Syrian Kurds reject the claim.

A Turkey-based Kurdish militant group - the Kurdistan Freedom Hawks (TAK) - has said it carried out the 17 February attack.

The TAK was once linked with the PKK. The two groups are classified as terrorist organisations by Turkey and the US.