The columns marching towards Maribor , where transit camps were set , were moving along the Drava River . During the march , bodies could be seen floating in the Drava and on the banks of the river . The first prisoners arrived in Maribor on 17 May and were placed in transit camps . Other larger columns arrived in the following two days . At the camps , prisoners were sorted based on their unit and year of enlistment . A part of the prisoners were sent on further marches or transported with trains to Celje and Zagreb . The rest were brought by trucks to anti-tank trenches in Tezno near Maribor , with their hands tied with wire , where they were lined up and killed . The killings lasted for several days until the trenches were filled with dead bodies . It is estimated that around 15,000 people were killed in the Tezno massacre , mostly members of the HOS
Tezno massacre
Tezno massacre
Bleiburg repatriations