A 5.7-magnitude earthquake struck southwest Iran near the border with Iraq on Monday, causing one death due to a heart attack and dozens of injuries, the country's relief and rescue organisation said. The quake, whose epicentre was in the Masjed Soleiman area of Khuzestan province, hit at 11:30 am (0700 GMT) at a depth of 17 kilometres, the national seismological centre reported. The region was rattled by seven aftershocks, the strongest of which measured 4.7 magnitude, it said. At least 45 people were injured, the head of Iran's relief and rescue organisation, Morteza Salimi, told state TV.