Turkish authorities have arrested 40 foreign nationals over supposed links with Islamic State, according to the country’s state-run Anadolu news agency.
The agency reported that police carried out simultaneous raids on 23 addresses in Istanbul’s conservative Fatih district, detaining suspects from Afghanistan, Iran, Iraq and Azerbaijan.
Some of the arrested have been identified as having traveled to areas of conflict in Syria several times.
Turkey, which shares a border with Syria, has suffered a series of terrorist attacks by Isis over the past year - notably an attack on the Ataturk airport in June. The attacks have significantly destabilised the country.