The CBI on Saturday launched a search operation at over ten locations in connection with the National Stock Exchange (NSE) co-location scam involving the financial institution's former MD and CEO Chitra Ramkrishna and the ex-Group Operating Officer Anand Subramanian.

According to a source, the raids, which started this morning, were underway in Delhi, Kolkata, Mumbai, Gurugram, Gandhi Nagar besides other parts of the country.