Thane Municipal Corporation (TMC) and the district administration jointly carried out the demolition drive and cleared all encroachments from a four-km stretch at Reti Bunder in Mumbra township.
A release by the civic body said around 350 commercial and 250 residential structures built illegally on the stretch were razed during the operation carried out by 200 workers with the help of JCBs and other equipment.
Municipal Commissioner Sanjeev Jaiswal, District Collector Mahendra Kalyankar and DCP (Zone-I) Abhishek Trimuke supervised the anti-encroachment drive which was initiated in the morning and went on till the evening.
During the drive, some hoodlums pelted stones at the jeep of an Assistant Municipal Commissioner and damaged its glasses, said TMC Public Relations Officer Sandeep Malavi.
No one was injured in the stone pelting. A police complaint will be lodged in this regard, Malavi said.