Shamli Superintendent of Police Abdul Hameed said the accused -- Islam, Sazim, Anwer, Israeel, Nazim and Vikky -- attacked the police team with sticks and stones to free three alleged members of the sand mafia.
At least five policemen were injured in the attack that took place at Chotra village in the district on May 15.
A mob had cornered police to ensure the release of the three and even tried to crush some officials under a tractor. They also looted three police vehicles and an AK-47 rifle, which were later recovered.