The deadly accident happened on A5 highway near Gaweinstal in the direction of Vienna at about 7 am on Aug. 12.
The vehicle drove through the railing of a bridge, rolled over, and came to rest on a road beneath the highway, Austrian media reported with pictures.
Five rescue trucks, three ambulances, and a helicopter from the nearby town of Gaweinstal came to the scene.
The driver, who survived the incident, admitted that he fell asleep for a few seconds.
Two adults and two children — a three-year old and a seven-month-old — were killed in the incident. The children's grandmother and grandfather were killed in the accident, firefighters said.
Four other passengers, including a child, suffered minor injuries in the crash.
No Polish citizens were in the minibus which had a Polish license plate, Polish deputy foreign minister, Paweł Jabłoński, told PAP news. There were only Ukrainians onboard, he added.
The Ukrainian family had residence permit in Poland, Austrian news outlet Salzburg24 reported.
The Polish side immediately informed Kyiv about the tragic accident. Austrian police are also in contact with Ukraine.
Ukraine's Foreign Ministry has yet to comment on the deadly crash.
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