They said the accident took place when the MLA's driver lost control of the vehicle, which crossed over to the other side of divider and collided head on with the truck.
Besides Singh, the 45-year-old MLA from Noorpur constituency in Bijnore district, his two bodyguards and the truck's cleaner were also killed, police said. The bodyguards were identified as Deepak Kumar (32) and Brijesh Mishra (30).
The summit in Lucknow was inaugurated today by Prime Minister Narendra Modi.
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