Bulgarian police found the bodies of two women migrants frozen to death near the Malko Turnovo border crossing with Turkey on the night of February 6 2016.
One was 18 and the other 34. The two were part of a group of about 18 migrants that entered Bulgaria illegally.
Authorities were seeking to confirm the nationalities of the group, thought to be variously Iraqi Kurds and from Afghanistan.
Border Police found the group stranded in the snow. Eleven children and six adults from the group were being treated in Bourgas Hospital, hospital director Dr George Matev said.
One of the children had a gastrointestinal illness and four of the adults were being treated for mild frostbite, Matev said.
Border Police head Antonio Angelov said that communication with the group was very difficult because they were in poor health and because of the language barrier.
Police believe that the group was abandoned by traffickers. The group were disorientated and did not know where they were.