At least six workers have been killed in a coal mine accident in eastern India, and police said Friday that 17 others could remain trapped in the mine. S.K. Singh, the general manager of the Rajmahal Open Cast Mines in the eastern Indian state of Jharkhand, said the mine collapse took place late Thursday and that heavy smog prevented rescue workers from entering the mine until early Friday morning, AP reported. Jharkhand police spokesman R.K. Malik said 23 workers were reported missing after the accident, and that after six bodies were recovered 17 remain unaccounted for. Several rescuers are now working at the accident site, Malik said.