Police in Macao, the world's biggest gambling hub, said on Sunday they had arrested two men for alleged illegal gambling and money laundering, as authorities step up a crackdown on illicit capital outflows from the Chinese mainland.

"One of the men involved was responsible for operating an illegal gambling syndicate while the other offered assistance," the police said in a statement on their official WeChat account, without naming either man.

Macao Legend Development, a company that owns and operates a casino resort in Macao, said its chief executive Chan Weng Lin had been arrested and detained by police, in a statement to the Hong Kong stock exchange on Sunday.