Jaipur, Sep 24 (PTI) A bus rammed into a stationary dumper in Rajasthan's Barmer district, leaving a government school principal and a girl student dead while 20 others were injured, police said on Sunday. The accident occurred near Sehlau village on Saturday night when the victims were returning to Detani in Barmer after attending a music competition in Jalore. A district administration official said that a group of students from Swami Vivekanand Government Model School, Detani had gone to Raniwada in Jalore to attend the competition. The students were accompanied by the principal and three teachers. Three critically injured girls have been admitted to a hospital in Jodhpur while the other have been admitted to a hospital in Barmer.