Mankhurd - Dumper drivers have been taking advantage of the dark to dump debris at night illegally at many places near a nullah in Sathe Nagar on the Ghatkopar-Mankhurd highway, creating problems for local residents. Recently, three dumpers dumped debris at the same spot, which residents allege is the handiwork of land and sand mafia. They allege that the local administration has not taken any action against the culprits yet.