A police team yesterday went to Toda village to remove encroachments on a street when the protesters started hurling stones at them, station house officer (SHO) Amardeep Lal said.
"A case has been registered against 55 people, while four persons have been arrested till now," said the SHO, adding that a police constable, posted elsewhere, was also involved in the attack.
The injured policemen, including two sub-inspectors, have been admitted to a hospital.
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