"Following intelligence indicating that the IS terrorist organisation was planning attacks during Christmas and New Year celebrations," the prosecutor's office ordered the detention of 137 people, 115 of whom have been arrested, the Istanbul prosecutor general's office said in a statement.
Türkiye shares a 900-kilometre (559-mile) border with Syria, where jihadist groups are still active and where the IS was accused of an attack in mid-December that killed two US soldiers and one civilian.
