Four persons, including a woman, are feared trapped in an abandoned coal mine for the past two days, with the local police having failed to trace them, a senior police officer said.

A team of NDRF personnel will carry out search and rescue operations at the Bharat Coking Coal Ltd (BCCL) mine in Chandankiyari block of the district, the officer said.

Bokaro SP Chandan Kumar Jha said the four victims — all residents of Tilatand village — had entered the quarry for illegal mining and got trapped after the mine collapsed on Friday.