Istanbul Mayor Ekrem Imamoglu was arrested on corruption charges, including running a criminal organization and accepting bribes. The court rejected terror-related charges but he still faces prosecution. Protests have erupted against his arrest, with accusations against President Erdogan for political targeting. Imamoglu's party, CHP, is holding a primary election to support him, while Erdogan defends the judiciary's actions. Domestic and international reactions criticize the arrest as a threat to democracy.