Prosecutors in Istanbul have completed a sweeping indictment against the city’s mayor, Ekrem Imamoglu, seeking a prison sentence of more than 2,000 years in what they describe as one of Turkey’s largest corruption cases.

According to Hurriyet Daily News and Reuters, the 3,900-page document identifies Imamoglu — a key figure in the opposition Republican People’s Party (CHP) — as the “founder and leader” of a criminal organization. The indictment, finalized after an eight-month investigation, names 402 suspects, including 105 currently in custody.

Chief Prosecutor Akın Gürlek told reporters that the alleged crimes span a 10-year period and caused an estimated 160 billion Turkish liras ($3.8 billion) in public losses, plus $24 million in foreign funds and dozens of properties. The charges include bribery, money laundering, fraud, and bid-rigging.

Imamoglu, who has been imprisoned since March and is President Erdogan’s main political rival, could face between 828 and 2,430 years behind bars if convicted. Prosecutors also accuse the CHP of misusing public funds for election campaigns and transferring illicit proceeds through a “pool system.” The indictment calls for the closure of the CHP, Turkey’s main opposition party, under Article 69 of the Constitution.

CHP leader Özgür Özel denounced the charges in a parliamentary address, calling them politically driven. “What is Imamoglu’s crime?” he asked. “That he will run for president in the next election.”

The court will now decide whether to accept the indictment and set a trial date — a move that could further escalate Turkey’s already polarized political climate.