The Madurai district police arrested 21 persons accused of violating various norms in connection with the granite quarry operations here on Wednesday.

Based on the complaints from the Village Administrative Officers, the Keelavalavu and Othakadai police had registered criminal cases against granite quarry staff and operators including the partners/directors of PRP Granites and Exports, Sindhu Granites and Olympus Granites, among others. In the process of granite quarrying, the workers had allegedly indulged in trespass, encroached into government land, suppressed evidence and deviated from licence norms for quarrying.