A train has slammed into a bus in southern Serbia killing three people and injuring 22, AP reported. The collision took place around 0630 GMT on Friday near the city of Nis, Serbian police say. The injured have been transferred to a nearby hospital, according to the statement. Doctors say six of the injured have been seriously hurt. The Serbian state TV says that the bus was carrying local children to school. A video from the scene shows that the bus was cut in half from the impact while the train partly slid off the tracks.