Domestic helpers along with five ringleaders detained in series of police raids on Monday.
Women alleged to have been recruited to open bank accounts taken over by syndicate to launder cash.
More than a dozen Hong Kong domestic helpers were among 18 people arrested in a crackdown on a syndicate said by police to have laundered HK$35 million (US$4.5 million) in dirty money.
Police on Tuesday said a Nigerian man, a Bangladeshi man and three Indonesian women, said to be the key figures in the scheme, were also caught in the police net.