The alleged fourth member of a gang that kidnapped the daughter of a wealthy SAR textile businessman and her boyfriend in Toronto has been arrested at the Lowu border. The man, in his 50s, was arrested on Saturday afternoon as he was attempting to go through immigration, a police spokesman said last night. The wanted man's identity had been forwarded to Hong Kong police by their Canadian counterparts. The woman, 29, and her boyfriend, 27, escaped with minor injuries at about midnight on Thursday in Toronto after a six-day ordeal in which they were held captive in a car hidden in a garage. Their identities have not been released. Regional Crime Unit officers on Hong Kong Island had been working round the clock in the hunt for the suspect. Officials at all exit points, including the airport and land borders, had been alerted to be on the lookout for the wanted man. The couple were kidnapped on December 21 from the woman's flat in Toronto. The kidnappers then phoned the woman's father in Hong Kong and demanded C$1.3 million (HK$6.5 million) in ransom to be paid in the SAR, but no payments had been made. According to the Toronto Sun, another suspect was arrested on Friday night after police raided the man's home in Toronto. Two other suspects were arrested about an hour after the kidnapped couple managed to free themselves and walk into a Toronto police station about midnight on Thursday. The couple were dishevelled, with matted hair and dried blood on their clothes. The two had cuts on their hands and were treated by paramedics. They had been held in a car and allowed out only to relieve themselves in the garage. The arrested trio - Swee Hoh, 32, Van Huynh, 31, and Sunny Kwan, 50, were jointly charged with kidnap, forcible confinement, assault with a weapon and related charges. They appeared briefly in a Toronto court yesterday. The handcuffed trio, wearing prison jumpsuits, were ordered by Justice of the Peace Albert Chang-Alloy to reappear in court today. They remain in custody. The businessman's daughter was reunited with her brother, who flew to Toronto from Hong Kong to comfort her. 'They were very happy to see each other,' Detective Daryl Emilio was quoted as saying by the Sun. 'The woman is Canadian and will be staying here.'