Gwalior: A speeding truck hit a tractor- trolley head-on at Rairu by-pass road in the district, killing seven persons and injuring 14 others, the police said on Sunday. While six persons were killed on the spot, one died later in the hospital, said Additional Superintendent of Police Dinesh Kaushal, adding the injured have been admitted to a hospital. The victims were travelling in the tractor-trolley. (PTI)