TEHRAN -- A fire that broke out at an oil export facility in southern Iran was brought under control without causing any damage, according to local media. “A fire has occurred in an open oil channel leading to the export port in the city of Mahshahr,” Fars news agency reported after the Sunday incident. The Tasnim agency described the fire as “minor,” adding that there was no “human or financial loss.” A security manager at the port, quoted by the Rokna news website, said the fire was caused by technical failure in a lighting system near the open channel. A thick layer of smog envelops the city in winter as cold, heavy air traps construction dust, vehicle emissions and smoke from crop stubble burning in neighbouring states, causing a surge in respiratory illnesses among its 20 million people.