Central Bureau of Investigation (CBI) has arrested the former Managing Director and Chief Executive Officer of National Stock Exchange (NSE) Chitra Ramkrishna in Delhi in connection with the co-location scam. Yesterday, CBI had called her for questioning and she was arrested later. She will be produced before a court today. A Delhi court had on Saturday refused to grant anticipatory bail to Ramkrishna.<br />''<br />''<span style="color: #222222;">Securities and Exchange Board (SEBI) has slapped a penalty of 3 crore rupees on Chitra Ramkrishna in the co-location case.</span><br />