Turkey has vowed to retaliate against the perpetrators of a powerful blast in the capital Ankara that left at least 28 people dead and 61 injured.
"Turkey will not shy away from using its right to self-defence at any time, any place or any occasion," President Recep Tayyip Erdogan said.
Officials said a vehicle full of explosives was detonated as military buses were passing by on Wednesday.
Funerals are expected to take place later on Thursday.
No group has so far said it was behind the attack.
The US condemned the blast, with National Security Council spokesman Ned Price saying: "We stand together with Turkey, a Nato ally, a strong partner."
The blast happened in an area close to parliament and military headquarters.
Large plumes of smoke were seen rising from the area and witnesses said the blast was heard all over the city.
Some of the victims were civilians.
In a separate development later on Wednesday, an explosion damaged a building housing a Turkish cultural centre near the Swedish capital Stockholm, officials said. No-one was injured.
