Iranian news agency Tasnim reported Monday that Iran's telecommunications infrastructure company thwarted a 'major cyber attack' against the country's infrastructure on Sunday. According to the report, the attack was 'one of the most complex and extensive' Iran has ever faced. On Saturday, an explosion occurred at the Bandar Abbas port in southern Iran, igniting a large fire that killed approximately 40 people. That same day, Iran held another round of nuclear talks with the United States.