Jai Singh (55), Meera Devi (50) and their nephew (3) were killed on the spot when the truck hit their motorbike, they said.
As soon as the news spread, locals got agitated and set afire three trucks, police said.
When police tried to control them, they started pelting stones in which two policemen were injured, including Circle officer Jangbahadur, they said.
Later, police had resort to firing in the air to control the situation.
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