HONG KONG, Jan 31 (Reuters) - Shares of Macau Legend , a company that owns and 안전놀이터 operates a casino resort in Macau, fell 16% in early trading on Monday after it said its chief executive had been arrested and detained by police in the world's largest gambling hub.

The move came as authorities step up a crackdown on illicit capital outflows from the Chinese mainland and after the high profile arrest of Suncity boss Alvin Chau.

(Reporting by Donny Kwok and Farah Master Editing by Shri Navaratnam)