Diners are being warned to beware of a con man posing as a dim sum restaurant captain who stole credit cards from three customers when they paid their bills in three different restaurants. The man, wearing a black suit and red tie, used the cards to buy two iPhones and gold ornaments worth a total of HK$25,000 before the card owners discovered the scam. Police believe the items were resold. Police said one victim was told he would get a 10 per cent discount if he paid the bill with a credit card. Surveillance camera footage taken from the restaurants showed the man acted alone, a police officer said. He first struck at the Star Seafood Restaurant in North Point on February 28, taking a male customer's credit card and using it to buy gold ornaments worth about HK$13,000. On March 13, a 49-year-old man was conned out of his card while having lunch at Maxim's dim sum restaurant in Kowloon Bay. It was used to buy an iPhone. The latest case took place in another Maxim's restaurant, in Tseung Kwan O, on Sunday when a 36-year-old woman lost her credit card, which was also used to buy an iPhone. 'The culprit chose to strike in busy hours and approached victims when they raised hands asking for the bill,' the officer said. 'All three cases happened during lunchtime on either Saturday or Sunday when there were a lot of customers and employees were very busy.' The officer said the victims handed over their cards even though a bill was not put before them. The Cantonese-speaking thief is aged between 30 and 40, of medium build and wore glasses. 'It's possible that the culprit is a restaurant worker or former restaurant employee,' the officer said. Frontline officers have been issued with photographs of the man.