Raipur, Seven people were killed and 50 others injured in a collision between a bus and truck on a national highway near Chhattisgarh capital Raipur.According to information gathered from police sources, a bus carrying labourers from Odisha to Gujarat collided with a stationary truck at Chheri Kheri falling under the jurisdiction of Mandir Hasoud Police Station in Raipur. Six labourers in the bus died on the spot while another injured labourer succumbed to injury in hospital.About 50 other labourers travelling on the bus were injured after the accident. They were admitted to Raipur Medical College Hospital. Condition of about a dozen injured labourers is stated to be critical.