Hong Kong’s regulator asked Standard Chartered Plc to conduct an investigation after more than a hundred local customers complained about unauthorised credit card transactions.

The Hong Kong police as of late Thursday had received 159 complaints related to the transactions, which are now being investigated by the Commercial Crime Bureau, according to a police spokesperson.

A spokeswoman for the Hong Kong Monetary Authority said it will require the lender to take appropriate measures to protect the interests of customers and conduct a thorough investigation into the cause of the incident.

The number of impacted cardholders amount to about 1% of its credit card accounts, according to a spokeswoman for the bank. Standard Chartered has tightened monitoring and the number of suspicious transactions has dropped significantly, she said.

“We believe the incident was a result of random attempts at low-value credit card transactions,” the spokeswoman said. “There is no indication of any personal data leakage from the bank.”

The bank has also been lambasted on social media by customers who said they can’t reach its hotline.

 - Bloomberg