Six persons were killed and six others seriously injured in two separate road accidents in Ganjam district on Saturday. Three persons were killed and three others were seriously injured when an auto-rickshaw collided head-on with a speeding truck at Dhinkisala under Sheragada block. In another incident, three persons were killed and three others were gravely hurt when a tractor, in which they were travelling, overturned near Gopapura village under Kabisuryanagar block. While the injured have been hospitalized, the identities of the deceased were yet to be ascertained.