India, Nov. 23 -- Fresh dumping of debris, excavation and concreting along the banks of the Chena river near Ghodbunder Road over the past two days have triggered concerns among environmental activists, who say the work violates multiple environmental rules.

Videos captured this week show JCBs digging through grasslands, mangrove roots exposed, debris pushed into the river and concrete embankments extended along the water's edge. Complaints about these violations were filed on Friday and Saturday with the Thane deputy conservator of forests, the Maharashtra Pollution Control Board (MPCB) and the Mira-Bhayandar Municipal Corporation (MBMC).

The activity is part of the Chena Riverfront Development Project initiated by Shiv Sena MLA Pratap...