A city-based environmentalist has alleged that land filling is going on at an eco-sensitive zone (ESZ) at Film City in Goregaon near Sanjay Gandhi National Park (SGNP), allegedly to construct a set. The spot in question is used for the cultivation of paddy by local tribals. Environmentalist Stalin D has written a letter to the deputy conservator of forest Thane, collector of Mumbai Suburban district, environment secretary and chief conservator of forest, SGNP, red-flagging the activity.