"We have received some complaints, and we are looking into the matter", SP Pankaj Kamboj said, warning of strict action against the guilty.
According to police sources, luxury buses carrying passengers have allegedly been carrying illegally-mined coal on the roofs of their vehicles and unloading it at specified spots.
So long the police had focused on trucks, tri-cycles and bi-cycles which are engaged in the transport of illegally-mined coal.
Only last month the police seized tons of it, the sources said.
