The Islamic State (IS) group is the prime suspect in the Ankara bombings that killed nearly 100 on Saturday, Turkish PM AhmetDavutoglu has said.
No group has said it carried out the attack, but the government believes that two male suicide bombers caused the explosions, hitting a peace rally.
The official death toll is 97, but one of the main groups at the march put the number of dead at 128.
The funerals of more of the victims are taking place on Monday.
Saturday's twin explosions ripped through a crowd of activists outside the main railway station in the Turkish capital.
They were due to take part in a rally calling for an end to the violence between Turkish government forces and the militant Kurdistan Workers' Party (PKK).
There is anger in Turkey that authorities were unable to prevent such a major attack - and some scepticism from opposition groups about the government's claims.