It was a Kurdish wedding party. 51 confirmed dead.
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Deadliest recent attacks on civilians in Turkey
20 August: Bomb attack on wedding party in Gaziantep kills at least 51 people, IS suspected
29 June: A gun and bomb attack on Ataturk airport in Istanbul kills 41 people, in an attack blamed on IS militants
13 March: 37 people are killed by Kurdish militants in a suicide car bombing in Ankara
17 February: 28 people, many of them civilians, are killed in an attack on a military convoy in Ankara
12 January: 10 people, including at least eight German tourists, die in a suicide bombing in Istanbul, thought to have been carried out by IS
October 2015: More than 100 people die in a double suicide bombing at a Kurdish peace rally in Ankara - the deadliest attack of its kind on Turkish soil
Turkey wedding suicide bomber 'was child aged 12-14' - BBC News