The missing Interpol chief, Meng Hongwei, who it was revealed on Sunday has been detained in China for 12 days unknown to his family or employer, has resigned from the international police agency. Interpol said it had received his resignation “with immediate effect” late on Sunday. It was the latest twist in the mystery of Meng’s disappearance last month after he flew from France to China. In a terse statement on Sunday evening, the Chinese authorities had admitted they were holding Meng under investigation by a new government anti-corruption unit for suspected “violations of the law”.