The suspension is the latest run-in with regulators in Asia for the US bank trying to grow business in booming emerging markets, coming after it compensated customers for alleged fraud in India and a fine in Japan over stock ownership filings.

The alleged theft of around $2 million from wealthy Citi clients in Jakarta is being investigated by Indonesian police, who have taken into custody a 47-year-old former wealth manager and a Citibank teller.

“On the violations, Bank Indonesia has decided supervisory actions among others... to temporarily suspend adding new Citigold customers,” Darmin Nasution, governor of the central bank that also acts as financial regulator, told the parliament’s finance commission on Wednesday.

Nasution said the suspension took effect while the central bank is conducting further investigation on the bank’s internal controls.

“Problems in particular were triggered by the lack of application of internal controls, as should have been done, as reflected by the lack of supervision by supervisors,” said Nasution.

Citibank said on Tuesday it had identified suspicious transactions in its Indonesian operations and was committed to recovering the loss suffered by affluent Citigold customers.

The US bank did not give the size of any financial loss and said the case was an isolated incident. Citigold customers in Southeast Asia’s biggest economy would have minimum savings of 500 million rupiah ($58,000), Citibank Indonesia said.

Local and foreign banks are growing rapidly in Indonesia, as they seek to tap wealthy tycoons, strong corporate loan growth and relatively low retail customer bank usage.

“I don’t think this issue will be a big blow to Citibank operations in Indonesia...rich people will always come back to Citi, so this will have a small impact in the short term but it will be fine in the mid to long term,” said Pardomuan Sihombing, head of research at brokerage Recapital Securities in Jakarta

“This actually could help us strengthen our regulations,” he added.

The country’s parliament has yet to approve a bill for a new banking regulator, to be called the OJK and modeled after the UK’s Financial Services Authority, leaving Bank Indonesia carrying out a dual role as central bank and regulator.

In January, Citibank in India said it had begun the process of working toward fair compensation for customers affected by an alleged employee fraud at its branch in Gurgaon.

This came a month after the securities watchdog in Japan ordered Citigroup to pay a $274,000 penalty for failing to make filings on stock holdings properly, the first such fine in the country.

Indonesia’s parliament summoned Nasution, Citibank and police on Wednesday to answer questions on the issue, although the case has yet to go to court, not an unusual step for lawmakers on cases that attract widespread public attention.

Indonesian police told parliament they are also investigating the case of a Citibank credit card user that died last week in Jakarta following questioning by debt collectors over an unpaid bill, and have arrested four suspects.

Citibank has said it is cooperating fully with police to determine if agency staff had adhered to its code of conduct on debt collection, and does not believe any physical harm was done to the client when he came to the bank’s office.

Citi has around 15 percent of the credit card market, according to Indonesia’s credit card association.