Hong Kong police had laid charges against eight other people for allegedly abducting a man and holding him for about a week at a squatter hut in Tai Po, where he was said to have been badly beaten.
Guangdong authorities arrested seven other suspects in Shanwei and Foshan over the past few days, a source said.
Police are expected to press charges against the new suspects later.
Last year, officers reported that a 39-year-old man was kidnapped by a gang in Kowloon Bay on November 6 as he met someone who had claimed online to be interested in buying digital currency.
The man was allegedly lured to an industrial building in the area, before being taken to a container terminal and later a remote squatter hut in Nam Hang Tsuen.
Police said the alleged kidnappers demanded a HK$30 million ransom from the man’s family, but this was not paid. The alleged victim managed to escape on November 12, officers said.
