An isolated number of hotels in the U.S. and Europe were affected, Mandarin Oriental said. The hotel chain said the malicious software had been “undetectable by all anti-viral systems” No other personal information was taken, the company said. An investigation is underway by law enforcement and forensic specialists. Retailers including Home Depot and Target have experienced large leaks of payment card details that have been attributed to point-of-sale (POS) malware that collects the card details after a card has been swiped.”]