Of the dam and the helicopter he was travelling in. A convoy of three helicopters is believed to have then travelled across iranian territory. Two returned back safely, but the one carrying the president and Foreign Minister crashed in mountainous territory in heavy fog. All contact with it was then lost. Our correspondent Caroline Hawley reports. You can see how bad conditions were in the area, as the Rescue Operation was under way. A fleet of ambulances on standby. The army is reported to have ordered all resources needed to be thrown at the search. Members of irans red crescent scoured the rugged landscape on foot for any sign of the missing helicopter, but Poor Visibility made it difficult for the rescue teams to reach the scene of the crash even to locate it. Translation there are currently three drone teams in the area but due to the thick fog and low visibility, the drones were not able to successfully operate. There are also three teams with rescue dogs in the area. We are sear