A policeman in civil dress was yesterday stabbed to death by unidentified persons in Palamau district, a senior police officer said. Rajvansh Ram, a havildar deputed at Town police station here, was attacked at Hutti Bazar Hat in the morning, district SP Surendra Kumar Jha said.

The victim was a resident of Sasaram in Bihar. The cause behind the killing was not yet established, he said adding that police investigation has begun.