Vietnam arrested another top banker Thursday, state media said, widening a police probe into the communist country\'s banking sector which has rattled markets and triggered a run on deposits. The arrest of Ly Xuan Hai for \"deliberate wrongdoing causing serious consequences\" came just hours after the Asia Commercial Bank announced he had resigned from the position of director general, Thanh Nien online reported. Police have raided the French-educated banker\'s house in southern Ho Chi Minh City and his office, the report said. Hai\'s arrest deepened the problems facing ACB, which has seen its share price dive nearly 20 percent and had jittery depositors withdraw more than $200 million of deposits since its flamboyant founder was arrested Monday. Multi-millionaire Nguyen Duc Kien, 48, a shareholder in some of Vietnam\'s largest financial institutions and one of the founders of ACB, was detained for \"illegal business activities\" after police raided his Hanoi home. The benchmark VN Index plunged 4.2 percent Thursday led by bank shares, raising losses at the bourse to nearly 10 percent since the scandal broke and prompting the Securities Commission to call for calm. More than $240 million was withdrawn from ACB on Tuesday, the Tuoi Tre newspaper said, while the price of gold has surged as savers scramble for a safe haven. News of Hai\'s arrest emerged after ACB branches had closed Thursday. The central bank had previously said Kien\'s arrest is not related to the ACB -- where he holds a less than five percent stake -- but concerned accusations of wrongdoing at three smaller financial companies where he is chairman. As well as his stake in ACB -- which counts global banking giant Standard Chartered as one of its \"strategic partners\" -- Kien is said to hold shares in Sacombank, Eximbank, VietBank and others. He was reportedly involved in drafting the country\'s new bank reforms. But Hai\'s arrest brings a new dimension to a scandal that has already sent shockwaves through the communist country, said Vietnam expert Carl Thayer, emeritus professor at the University of New South Wales in Australia. \"It\'s a new ballgame,\" he said. \"Clearly the private sector is coming under scrutiny.\" Other experts warned that the growing scandal could spook already jittery foreign investors, particularly in Vietnam\'s already-fragile banking sector. Hai has been replaced by Do Minh Toan, previously ACB Deputy Chief Executive Officer, according to VietnamNet. At ACB branches in Hanoi on Thursday, customers queued to withdraw their savings forcing the central bank to send truckloads of cash to ensure liquidity, an AFP reporter saw. \"Thanks to advance preparation we still ensured good repayment,\" ACB\'s Toan told Tuoi Tre. The central bank pumped more than $600 million into the banking system Wednesday -- double the sum of Tuesday\'s intervention -- according to official data. Its governor Nguyen Van Binh has issued rare public assurances that depositors\' funds are safe, pledging to \"ensure liquidity for ACB and other banks if there is a mass withdrawal\". The communist country\'s Securities Commission urged the public not to panic and said retail investors should be \"calm and prudent\" in their securities transactions to avoid losses.