ISTANBUL – The mayors of two major cities in southern Turkey were arrested Saturday, state-run media reported, joining a growing list of opposition figures detained since the mayor of Istanbul was imprisoned in March.

Abdurrahman Tutdere, the mayor of Adiyaman, and Zeydan Karalar, who heads Adana municipality, were detained in early morning raids, according to Anadolu Agency. Both are members of the main opposition Republican People’s Party, or CHP.

Karalar was arrested in Istanbul and Tutdere was arrested in the capital, Ankara, where he has a home. Tutdere posted on X that he was being taken to Istanbul.

In total, 10 people were arrested as part of an investigation by the Istanbul Chief Public Prosecutor’s Office into allegations involving organized crime, bribery and bid-rigging.

Details of the charges against them were not immediately released by prosecutors but the operation follows the arrests of scores of officials from municipalities controlled by the CHP in recent months.

Istanbul Mayor Ekrem Imamoglu, widely considered the main challenger to President Recep Tayyip Erdogan ’s 22-year rule, was jailed four months ago over corruption allegations.

The former CHP mayor of Izmir, Turkey’s third-largest city, and 137 municipal officials were detained earlier this week as part of an investigation into alleged tender-rigging and fraud. On Friday, ex-mayor Tunc Soyer and 59 others were jailed pending trial in what Soyer’s lawyer described as “a clearly unjust, unlawful and politically motivated decision.”

Also Friday, it was reported by state-run media that the CHP mayor of Manavgat, a Mediterranean resort city in Antalya province, and 34 others were detained over alleged corruption.

CHP officials have faced waves of arrests this year that many consider aimed at neutralizing Turkey’s main opposition party. The government insists prosecutors and the judiciary act independently but the arrest of Istanbul’s Imamoglu led to the largest street protests Turkey has seen in more than a decade.

Imamoglu was officially nominated as his party’s presidential candidate following his imprisonment. Turkey’s next election is due in 2028 but could come sooner.

The crackdown comes a year after the CHP made significant gains in local elections. Adiyaman, which was severely affected by the 2023 earthquake, was among several cities previously considered strongholds for Erdogan to fall to the opposition.