Islamic State, the militant organisation which controls large areas of neighbouring Syria and Iraq, has been blamed by the Turkish authorities for carrying out four bomb attacks in the NATO member state since June.
In the most recent on January 12, a suicide bomber killed 12 German tourists visiting Istanbul's Sultanahmet historical area.
Ankara attack: Turkey blames Kurd militants for bombing
This week Turkey blamed Islamic State in Syria for cross-border artillery fire that killed two people. Officials have estimated that up to 2,000 Turkish nationals went to Syria and Iraq to fight for Islamic State. Turkish courts have arrested more than 800 people for Islamic State links, they said.
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