The bomb blasts in Ankara on Saturday killed 97 people
Turkey's Prime Minister has said there is evidence to suggest suicide bombers who killed 97 people at a peace rally had links to Islamic State or Kurdish militants.
Ahmet Davutoğlu said some suspects may have spent many months in Syria prior to the attack in Ankara on Saturday.
Officials also say they have intelligence that Kuridsh PKK rebels and far-leftist militants were trained in Iraq as suicide bombers and sent to Turkey.
Mr Davutoğlu added that an investigation is under way to establish whether a security failure led to the bombing.
No one has claimed responsibility for Saturday's blasts, which occurred seconds apart outside Ankara's main train station, as hundreds gathered for a rally promoting peace with Kurdish rebels.
"As the investigation deepens, and based especially on certain results we have obtained through Twitter accounts and IP addresses, we can see that both Daesh (IS) and the PKK are groups that are likely to have played an active role," said Mr Davutoğlu.
The attack was similar to a suicide bombing the government blames on IS militants that killed 33 Turkish and Kurdish peace activists near the border with Syria in July.
Turkish news agency Dogan reported that police had detained 14 suspected members of Islamic State in the central Turkish city of Konya since the latest attack. [...]