Travelers who visited one of Donald Trump's Las Vegas hotels between May 19 and June 2 earlier this year may have had their payment information stolen by hackers, the company that runs the properties said in a statement to customers. It appears to be the first confirmation from Trump Hotel Collection that information taken in a breach at the international hotel chain -- suspected to have taken place in New York, Chicago, Los Angeles, Honolulu, Las Vegas and Miami – is being used against customers.

Banks previously detected a surge in fraudulent activity in July, sparking a flurry of media reports that Trump, the current frontrunner for the Republican presidential nomination, may have been targeted by point-of-sale hackers. Compromised financial information includes account numbers, card expiration dates, CCVs and cardholder names, according to a letter published by The Register Tuesday.

“While the independent forensic investigator did not find evidence that information was taken from the hotel's systems, it appears that there may have been unauthorized malware access to payment card information as it was inputted into the payment card systems,” stated the letter, sent by the legal firm Norton Rose Fullbright. “We recommend that you review credit and debit card account statements as soon as possible in order to determine if there are any discrepancies or unusual activity listed.”

Trump Hotels is also offering customers a year of free credit monitoring.

It's just the latest disclosure about a breach at a major international hotel chain. Mandarin Oriental, the luxury hotel group, said in March it was investigating a breach, and White Lodging, a chain of franchise hotels, admitted it was hacked twice over the course of the same year. Last week, cybersecurity journalist Brian Krebs reported that registers in gift shops and restaurants at “a large number of Hilton Hotel and franchise properties” throughout the U.S. had been compromised.