The inferno occurred near Kibuba along national route one between Kinshasa and Kikwit around 180 km from the capital Kinshasa.
The bus was travelling from Cairo when it turned over and was hit by the truck on a road in the southern province of Assiut, 320 kilometres south of Cairo.
Heavy rain causing poor visibility is said to have caused the bus to get hit by the train as it crossed over the tracks.
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