The detention is linked to allegations of irregularities and forgery related to municipal tenders, according to the Justice Ministry. Besikcioglu, who was elected mayor in 2024 on the ticket of the opposition Republican People's Party (CHP), is being investigated over alleged misconduct involving local government contracts.

Authorities are also examining issues related to parking lot leasing arrangements and construction zoning permissions as part of the inquiry. Before entering politics, Besikcioglu was widely recognised in Turkey for his role as the fictional detective Behzat C in the popular police drama of the same name, which aired from 2010 to 2019. His transition from television to politics gained attention when he secured victory in the 2024 municipal elections. The 2024 local elections marked a significant moment for Turkey's opposition, with the CHP strengthening its control over several major urban centres, including Ankara and Istanbul.

Besikcioglu's victory in Etimesgut was part of a broader opposition success against President Recep Tayyip Erdogan's ruling political alliance. The detention comes amid a wider series of legal actions against opposition-run municipalities across Turkey. Over the past two years, hundreds of elected mayors and local officials have reportedly faced arrest or investigation, primarily over allegations related to corruption and administrative irregularities. Opposition parties have repeatedly accused the government of using legal proceedings to weaken political rivals and undermine elected officials.

They argue that investigations into opposition-controlled municipalities are politically motivated, a claim authorities have rejected. The Turkish government has maintained that the cases are based on legitimate investigations into alleged wrongdoing and that judicial authorities operate independently. Officials have said that corruption allegations must be examined regardless of political affiliation. The investigation into Besikcioglu adds to growing tensions between Turkey's ruling authorities and opposition parties following the 2024 local elections.

The CHP's gains in major cities have increased political competition ahead of future national contests. Besikcioglu's case is expected to attract significant attention because of his public profile as both an actor and elected official. His supporters have demanded transparency in the investigation, while authorities continue examining the allegations against him. The latest detention highlights the ongoing political divide in Turkey, where disputes over judicial investigations, local governance and opposition rights remain central issues in the country's political landscape.