Turkey's state-run news agency says the Turkish military is pushing ahead with its cross-border artillery shelling campaign against U.S.-backed Syrian Kurdish militia positions in Syria.

Anadolu Agency reported late on Thursday that artillery shells had "intermittently" targeted militia positions near the town of Azaz.

The report came as Turkey blamed the Syrian militia group as well as Turkey's own Kurdish rebels for Wednesday's bomb attack in Ankara that killed 28 people. It also called on its allies to cut off support to the militia group.

The Kurdish militia, however, has been most effective in the fight against the Islamic State group in Syria.

Ankara appears increasingly uneasy over the group's recent gains across its border and has continued to shell the militia despite international calls for it to stop.