Turkey arrests 2 ISIS suspects in capital Ankara

Turkish police arrested two suspects accused of being members of Islamic State (ISIS) on Sunday in a dawn raid in the capital Ankara, state-run Anadolu news agency reported.

Police also seized documents and digital materials in the operation, including footage of the deadly attack in Vienna.

On Nov. 2, an Islamist gunman, named as dual Austrian-Macedonian national Kujtim Fejzulai, shot dead four people and injured more than 20 others in Vienna before he was killed by police.

Turkey was one of the principal routes for foreign fighters trying to join ISIS at the height of the group’s self-declared "caliphate."

There are an estimated 10,000 ISIS fighters in camps and prisons run by U.S.-backed Syrian Democratic Forces (SDF) across northeastern Syria.

Ankara considers the SDF, spearheaded by the People's Protection Units (YPG), as an extension of the outlawed Kurdistan Workers' Party (PKK), an armed group that has been at war in Turkey for over three decades, and has launched offensives against the group.