The incident happened when the victims, residents of Latehar district, were going to Kunkuri village in adjoining Chattisgarh in the jeep, police said.
The driver of the vehicle lost control in the wee hours and rammed into the truck. While two persons were killed on the spot, four others, including a woman, succumbed to their injuries on way to the hospital.
The seriously injured were referred to the Rajendra Institute of Medical Sciences in Ranchi, police said.
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