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A 32-year-old farmer was killed and three others injured after their buffalo carts were hit by a truck on the Delhi-Dehradun highway here early today, police said. The accident took place when they were returning in four different carts after unloading their produce at a sugar mill near Uttar Pradesh's Nawla village, they said. The deceased has been identified as Ikram. The police have launched a search for the truck's driver. Following the accident, farmers blocked the national highway.