A crash between a bus and a train travelling at high speed in northern Belgium has killed four people, including two children, and injured five other children, officials say.The injured children were hospitalised in a serious condition, said Lisa De Wilde, spokeswoman for the East Flanders public prosecutor's office. The collision happened at a level crossing during the morning rush hour on Tuesday (Tuesday afternoon AEST) near the town of Buggenhout, more than 30 kilometres north-west of the capital, Brussels.READ