Singapore  - Singapore police have arrested 15 foreign women in an operation against five unlicensed massage parlours this week, according to a news report on Friday.

The women were arrested on Wednesday and Thursday for allegedly working on invalid visas.

Their nationalities were not disclosed by police.

Police are also investigating the operators of the parlours.

"Police will continue to take tough enforcement actions against unlicensed massage establishments and will prosecute their operators and anyone who assist in their operations," Channel News Asia quoted deputy assistant commissioner Lau Peet Meng as saying. (dpa)