Hong Kong’s privacy watchdog is investigating a data leak affecting about 419,000 customers of Louis Vuitton, as the luxury giant suffers from a string of cyber attacks across its key markets in recent months.

Leaked data of the Hong Kong customers include names, passport numbers, birth dates, addresses, email addresses, phone numbers, shopping history and product preferences, the Office of the Privacy Commissioner for Personal Data said in an emailed statement on Monday. The affected database does not contain any payment information, a spokesperson for Louis Vuitton in Hong Kong said.

The office is looking into the case, including whether there is any delay in notifying authorities involved, according to the statement. It added that it has not received any complaints or queries regarding the leak.

The data breach in Hong Kong followed similar incidents in the UK and South Korea earlier this month, where hackers stole customer data from Louis Vuitton, the biggest brand of LVMH Moet Hennessy Louis Vuitton SE. Christian Dior Couture, another LVMH label, also reported in May that its customer data were compromised in a cyber attack.

Louis Vuitton’s headquarters in France found suspicious activities in its computer system on June 13 and discovered on July 2 that its Hong Kong customers were affected, said the privacy commissioner’s office, citing Louis Vuitton Hong Kong Ltd. The Hong Kong branch was informed of the incident on the same day and submitted a report of the data leak on July 17, the office said.

READ MORE: Tiffany sues LVMH over move to call off US$16 billion deal

After the discovery of an “unauthorized party” accessing some client data, Louis Vuitton took immediate steps to investigate and contain the incident with the support of cybersecurity experts, the brand’s spokesperson said. The company is working to notify relevant regulators and affected customers, and has strengthened the protection of its systems, the person added.