The incident took place in Bambla area of the district, a senior police officer said.
The trio have been arrested and a case registered against them, he said, adding that as per the version of the alleged assaulters the bus had hit their vehicle while they were on their way from Rajouri to Jammu.
The arrested people have been identified as Radhesh Sharma, Varun Gupta and Novjot Sharma of Rajouri district, he said.
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