Patna, Nov 26 (IANS) An unidentified man on Thursday threatened to kill Bihar Chief Minister Nitish Kumar in a bomb blast, police said.

Patna Senior Superintendent of Police Vikas Vaibhab said a case was registered in this connection at a police station in Patna.

The unidentified man telephoned a few Hindi newspapers and TV channels, and told them that he would kill the Janata Dal-United leader by exploding a bomb.

The media outlets then informed police, the official said.

Police have launched an investigation, and are trying to track down the call and the man.