By: Chang Jung-hsiang and Lee Hsin-Yin
The attackers, two of them under age 18, said they were just playing a prank, according to the police.
Separate assaults on Vietnamese workers were reported two days in a row in Tainan, raising concerns from their employers.
A Vietnamese worker was struck by eggs on April 15, while another three were assaulted in a similar fashion the following day, the police said.
Surveillance camera footage showed that the attackers rode motorcycles to follow the victims into alleys during late hours.