The death toll from the massive pile-up on the Trakia highway has risen to 12 after one of the most critically injured patients died in hospital, while investigators have ordered 51 expert assessments and plan to question around 100 people, authorities said. The patient, who had been admitted in the most serious condition to the Dr. Ivan Seliminski Hospital in Sliven, died overnight in the intensive care unit despite the efforts of medical staff, hospital director Dr....