A fire and clashes erupted at Tehran’s notorious Evin prison Saturday night as the protest movement sparked by Mahsa Amini’s death in custody entered a fifth week. The facility in northern Tehran is infamous for the ill-treatment of political prisoners and also holds foreign detainees. Hundreds of those detained during the demonstrations over Amini’s death have reportedly been sent there. Flames and a plume of smoke could be seen billowing into the night sky and the sound of what appeared to be gunfire could be heard in video footage shared by the Oslo-based Iran Human Rights on Twitter. “A fi…