Depositors in Vietnam have withdrawn hundreds of millions of dollars from Asia Commercial Bank, one of the country’s largest banks, after the arrest of tycoon Nguyen Duc Kien, one of its founders.

Nguyen Duc Kien, one of Vietnam’s richest businessmen, was arrested in Hanoi on Monday on suspicion of “economic violations”.

Shares in Asia Commercial Bank (ACB) slid as a result, causing depositors to panic.

The Central Bank has pumped millions into the bank to reassure depositors.

Large crowds of customers have gathered outside branches of ACB in Ho Chi Minh City and Hanoi.

Depositors in Vietnam have withdrawn hundreds of millions of dollars from Asia Commercial Bank after the arrest of tycoon Nguyen Duc Kien

The government has said that Nguyen Duc Kien, who owns just under a 5% stake in ACB, is not involved in the day-to-day running of the bank.

Nguyen Duc Kien, whose family is the fifth richest in Vietnam, co-founded ACB in the 1990s. He is seen as a politically well-connected tycoon.

The allegations against him concern other investment companies that he owns, but there is also concern about the whereabouts of ACB’s chief executive officer Ly Xuan Hai.

Some reports say it is widely believed that Ly Xuan Hai is also under arrest or may have resigned.

Ly Xuan Hai’s deputy, Do Minh Toan, has been quoted as telling state media that depositors withdrew about 5 trillion dong ($240 million) from ACB on Wednesday.

The bank run has also put pressure on the dong and has led to an increase in the price of gold – traditionally seen as a safe-haven investment at times of economic instability.

Since Wednesday the Central Bank has injected 17 trillion dong into Vietnam’s commercial banking sector in an effort to mollify depositors and the market.

Nguyen Duc Kien’s sudden arrest has prompted speculation about a power struggle in communist-run Vietnam, and a suspected plot to curb the power of Prime Minister Nguyen Tan Dung, to whom Kien has close ties.

ACB faced a run on its deposits in 2003 after rumors, which were later proved false, spread about the arrest of one of its executives at the time.

Nguyen Duc Kien is also a shareholder in other commercial banks, including Kien Long Commercial Joint Stock Bank and the Vietnam Export-Import Commercial Joint Stock Bank

He has also invested heavily in Vietnam’s professional football league.