Gandhinagar: Central Bureau of Investigation (CBI) has raided twelve locations across Noida, Gandhinagar, Kolkata and Mumbai in NSE Co-Location scam. National Stock Exchange (NSE)’s former Chief Executive Officer (CEO) Chitra Ramakrishna had been arrested by CBI in this case in March this year. Raids are underway in the World Trade Center in Gift City at Gandhinagar where the registered office of the top stock brokers is located. The stock brokers who allegedly benefitted through the NSE Co-Location server are being searched.