One of the suspects. (Photo: nld.com.vn)

The police said they have initially identified 25 people for alleged involvement in the case and have summoned one of them.

The police have appealed to victims to help identify the culprits. Initial investigations showed the attackers worked in groups and rode motorbikes.

The police recently received complaints from a group of foreign women that they were attacked violently, with the attackers throwing bricks at them or hitting them with belts.

The case is under investigation and the violators will be strictly punished in line with the law, the police stressed.

Some 91,000 foreigners from more than 100 nations and territories live and work in Vietnam, mainly in HCMC and Hanoi.