A Turkish court has jailed Istanbul Mayor Ekrem Imamoglu, President Tayyip Erdogan's main political rival, pending trial on corruption charges, sparking widespread protests. Thousands of people gathered in support of Imamoglu and the main opposition party opened polling stations for non-members to cast 'solidarity votes' for him. The court accused Imamoglu of leading a criminal organization, accepting bribes, embezzlement, unlawfully recording personal data, and rigging public tenders. The jailing of Imamoglu is part of a broader crackdown on opposition figures and elected officials in Turkey.