At least three persons were killed and 20 others injured in a road mishap in the eastern Indian state of Jharkhand Thursday, a senior police official said. "The incident happened when two buses in which the victims were traveling collided head-on near Dungo village in the state's Gumla district. One of the two buses was carrying tourists from the neighboring state of West Bengal and another was a private bus heading to state capital Ranchi," he said, on condition of anonymity. While three persons died on the spot, those injured have been admitted to a local hospital, the official said. A probe has been ordered into the incident, he added.