Expressing concern over untreated bio-waste, Delhi Pollution Control Committee (DPCC) has issued closure directions to 12 hospitals and identified 56 others in violation of biomedical waste norms.

"56 violators have been identified so far, Till June 26, total 12 bedded hospitals have been handed closure directions and given 7 days to vacate patients and close down," DPCC said in a statement on Friday.