The Beykoz Public Prosecutor's Office issued a detention order for four people, including Beykoz CHP mayor Alaattin Köseler, on charges of "bid rigging".

Within the scope of the same investigation, arrest, detention, search and seizure orders were issued for 17 people on charges of "bid rigging" and "establishing, membership and aiding an organization to commit a crime".

Those detained were taken to the Istanbul Police Department.