LUCKNOW, Jan. 29 -- The Central Bureau of Investigation (CBI) has expanded its probe into an alleged bribery case involving two Northern Railway officials after conducting late-night searches at their residences on Ayodhya Road, Lucknow, officials confirmed on Wednesday.

The searches were conducted at a flat in Spring Apartment, belonging to Akash Tyagi, an accountant in the office of the divisional railway manager (DRM), Northern Railway, Lucknow, and at the residence of Akshay Srivastava, assistant divisional finance manager (ADFM) in the same office. Both officials were arrested earlier after being caught allegedly accepting Rs.70,000 as part payment of a bribe linked to the processing of a pension case.

During the overnight searches...