New Delhi: The CBI Sunday registered a case against two private companies and some unidentified public servants in its ongoing probe in the alleged coal scam case and conducted searches at five places in West Bengal and Jharkhand.

The agency registered the case against Electrosteel Castings Ltd, Electrosteel Steels Ltd and some unknown public servants under sections of cheating, criminal conspiracy and Prevention of Corruption Act in its probe related to Parbatpur coal block - situated in the Jhariya coalfield in Jharkhand.