Credit Suisse fear causes Japan's bank stocks to plummet.

Japan's Topix Banks Index fell as much as 6.4% on Thursday due to fears of banking turmoil spreading around the world after Credit Suisse's troubles. South Korea's Shinhan Financial Group and KB Financial Group also declined. The Swiss central bank offered financial support to Credit Suisse, which borrowed up to 50 billion Swiss Francs ($53.7 billion) to strengthen its liquidity. Banking shares were hammered in Europe and New York on Wednesday after Credit Suisse's shares fell as much as 30%.