Dual attacks on Saturday evening — one a car bomb and one a suicide bomb — near an Istanbul soccer stadium killed 38 people and injured 155 more. Most victims were police officers on hand to deal with crowds following a soccer game.
Responsibility for the attack was claimed Sunday by the Kurdistan Freedom Hawks (TAK), an offshoot of the Kurdistan Workers Party (PKK), which has staged other attacks in Turkey this year. Turkish President Recep Tayyip Erdogan declared a national day of mourning while Interior Minister Suleyman Soylu promised retribution "no matter what the price" in a fiery speech at funeral ceremonies for those killed.
The attack was quickly condemned by Turkey's NATO allies, including the United States and the European Union.