In Istanbul, police backed by helicopters arrested at least 20 people suspected of having links to the banned Kurdistan Workers' Party, or PKK. The agency reported that Istanbul's anti-terrorism directorate said there were lawyers among those detained.
Turkish police also carried out raids in the southeastern province of Kahramanmaras, detaining 17 people, including students, in operations against the PKK and its youth wing.
Another 10 were detained in anti-PKK operations in the western Manisa province, including the local co-chairs of the HDP, an opposition pro-Kurdish party.
No group has claimed responsibility for the attack in Ankara on Sunday that killed 37 people.