Prosecutors in Yambol have asked the Road Infrastructure Agency for all documents on the opening and repairs of the road section where the crashes near Yambol killed 11 people. A Romanian driver who was detained after the crashes was questioned a second time, and Yambol police released him yesterday without charge.

Besides the 11 dead, there are also injured people.

The previous development: Romanian truck driver in Trakia motorway crash held as witness, no one charged

Prosecutors will order an expert study of the road's construction, based on the documents and on tests of the road surface.

Investigators have inspected the scene six times, including with a drone. They seized 20 vehicles, among them the Romanian driver's lorry and trailer. More inspections of the vehicles are due.

A combined vehicle and forensic medical study must show whether the crashes caused the deaths and the injuries.

New witnesses will be questioned, and investigators are looking for more people who saw what happened. After the experts report, prosecutors will decide whether there are grounds to charge specific people.