© AFP 2016/ YASIN AKGUL
The police operation was carried out in 11 Turkish provinces including Ankara, Istanbul, Izmir, Adana, Mersin and Gaziantep.
The detained people are accused of propaganda of terrorist ideas through social networks and providing support for terror groups.
Earlier on Monday, the Daily Sabah newspaper reported that Turkish law enforcers have detained 118 members of Turkey's pro-Kurdish Peoples' Democratic Party (HDP) following the attack in Istanbul.
On Saturday, two bombs exploded near the Vodafone Arena Stadium in the Turkish largest city, killing at least 44 people, mostly police officers, and injuring about 150. The country's authorities claimed that the Kurdistan Workers' Party (PKK) was tied with the twin blast.
Comment: The "Freedom Falcons" (TAK) claimed responsibility on their website, calling the attacks an "act of vengeance." This is the same group that took responsibility for the February Ankara attacks. They say they have nothing to do with the PKK, and the PKK says it has no control over them. More info here.
Update: Make that 568 people detained.