A fire broke out at Iran’s Evin prison on Saturday night, reportedly killing four inmates and injuring a further 61 – although it is likely casualties are higher than the official figures, according to social media. Several reports on social media state that inmates heard gunfire at night during the fire, although it is unclear what caused it. Tehran has blamed a ‘riot’ within the prison. Evin prison is used by the Islamic Republic to detain political prisoners, many of whom are students, lawyers, artists, activists and intellectuals who have spoken out or expressed views against the regime. M…