The mayors were active in the cities of Adana and Antalya in the south and Adiyaman in the southeast, according to party representatives. The arrests are part of a corruption investigation, claim the country's authorities.
A total of ten people were arrested in the dawn raids. Earlier in the week, over 120 people were detained in the opposition stronghold of Izmir.
The arrests are being criticized as politically motivated. The Turkish President Recep Tayyip Erdogan's regime is said to be trying to counter the secular CHP in various ways, which had major successes in last year's local elections.
In March, Istanbul's mayor Ekrem Imamoglu, a vocal Erdogan critic and the party's presidential candidate for 2028, was arrested, which triggered a widespread wave of protests – and continued mass arrests of CHP representatives.
