The incident took place yesterday when a police team seized seven tractor-trolleys loaded with sand, they said.
Sub-inspectors Aadesh Kumar and Bachchu Singh and constables Ankit, Vikas, Shahzad and Dipanshu were injured in the incident and shifted to a hospital, police said.
Police have registered a case against 150 people and named 19 in the FIR, they said, adding the accused are absconding.
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