Watch: Thick fog triggers multiple crashes on Bulgaria motorway; 12 killed

At least 12 people were killed and 46 others injured in a series of vehicle crashes caused by dense fog on a motorway in eastern Bulgaria on Tuesday. The accidents occurred on the motorway connecting the capital Sofia with the Black Sea port of Burgas, where poor visibility led to two major pileups, health minister Katya Ivkova said, AP reported. Police, firefighters and ambulance crews rushed to the scene on the A1 road that links the capital Sofia with the eastern city of Burgas. Videos show cars and trucks piled up across six lanes of highway, many crushed, overturned, or veered off to the side. The crashes forced authorities to close the motorway in both directions. Ivkova said 10 people died at the scene, while two others succumbed to their injuries while being transported to hospital. A total of 46 people were taken to medical facilities for treatment, she added. Authorities have not yet provided further details about the vehicles involved or the circumstances leading to the pileups.