Hong Kong police have arrested 10 people for allegedly providing services related to baby gender selection and arranging surrogate mothers.

The suspects, four men and six women aged between 30 and 70, were taken into custody on Friday and Saturday during raids on an office in Central and their residences.

Police said on Saturday night that they had received a tip-off earlier that a local company was advertising on two websites with claims customers could choose their babies’ gender and be connected to surrogate mothers.

The forced added that such promotion violated the Human Reproductive Technology Ordinance.

According to the ordinance, no person in Hong Kong is permitted to enable the sex selection of embryos through reproductive technology procedures, negotiate the arrangement of surrogacy services for commercial purposes, or publish, distribute or promote the two services, even if they are not performed in Hong Kong.

However, the legislation also lists some exceptions, such as preventing the birth children with a genetic disease linked to their sex.