Credit Suisse shares plunged more than 20 percent to new record lows after its main shareholder said it would not provide more financial assistance to the embattled Swiss banking giant. Switzerland's second-biggest bank, shaken by a series of scandals, was rocked once again after Saudi National Bank chairman Ammar Al Khudairy said it would "absolutely not" up its stake, as European stock markets plunged amid renewed concerns about the banking sector. NDTV's Sakshi Bajaj takes us through the details.