In Kerala, three senior citizens, who were on a morning walk were killed when a truck ran them over at Nooranad in Alappuzha district this morning.<br />''<br />''Police sources said one died on the spot, while two others succumbed to their injuries at the hospital.<br />''<br />''One seriously injured person has been admitted to the hospital. Police arrested the truck driver later.<br />''<br />''<br />