Shares of Credit Suisse plunged to all-time lows on Wednesday after its top shareholder said he would not plow more cash into the struggling Swiss banking giant — sparking fears that a global banking contagion is spreading.

Credit Suisse reportedly has asked the Swiss National Bank for a “public show of support” as its shaky balance sheet — crippled by withdrawals from skittish customers in recent months — has sparked speculation that a government rescue is coming.

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