New Delhi, Feb. 14 -- Delhi Mayor Dr. Shelly Oberoi alleged that some concessionaires involved in trash collection are "mixing construction and demolition waste" with garbage and dumping it at landfill sites, warning them of "tough action".

At a press conference held at the Civic Centre, the mayor also said the matter was brought to her notice a few days ago, and she wrote to the municipal commissioner on Tuesday to conduct a probe.

"It has come to my notice that (some) concessionaires are mixing C&D (construction and demolition) waste with MSW (municipal solid waste) to increase its (MSW's) weight and dumping it at landfill sites," the mayor told reporters.

Strict actions should be taken against concessionaires or agencies involved in...