In which modern-day country did the Tezno Massacre take place?

The Tezno massacre (Croatian: Pokolj u Teznom) was the mass killing of POWs of the Independent State of Croatia (NDH) that took place in Tezno near Maribor, after the end of World War II in Yugoslavia. The killings were perpetrated by units of the Yugoslav Partisans in May 1945, following the Bleiburg repatriations. Summary executions began on 19 May when first prisoners arrived to the Tezno forest from nearby prison camps and continued until 26 May. Most of the bodies were buried in a several kilometers long antitank trench, which the Yugoslav authorities concealed and kept secret.

In May 1945, at the end of World War II in Yugoslavia, soldiers of the Independent State of Croatia began retreating towards Austria, where British forces were located, with the intention to surrender to them rather than the advancing Yugoslav Partisans.

However, the British Army refused their surrender on the grounds that all Axis troops should surrender to the armies they were fighting against.

The prisoners of war at the border were thus repatriated to the Yugoslav Partisans.

It is estimated that around 15,000 soldiers and civilians were killed in the massacre. The graves were discovered in 1999 during a highway construction. Additional research of the burial sites was conducted in 2007 by the Commission on Concealed Mass Graves in Slovenia. In 2012, the Slovenian Government unveiled a memorial park at Tezno, where an annual commemoration is held.