One of the victims, 84-year-old Akkoyan Rsaliyev, lost consciousness at the start of the race and Akhmadi, 21, had covered around 16 kilometres (10 miles) when he died, Reuters reported.

Both individuals were known as regular participants in long-distance running events and had a history of active involvement in sports.

In an official statement, the organisers expressed their deep sorrow:

"The corporate foundation  Courage to be the First  offers its condolences to the families and friends of the deceased," organisers said in a statement.