165 people arrested for overstaying visas, working illegally
The raids were carried out by 487 local law enforcement officers in places such as construction sites, shops, eateries, and brothels.
According to the NIA, 74 people were arrested for overstaying their visas, while 91 were detained for working illegally in Taiwan.
The majority of them were Vietnamese and Indonesians, the NIA said.
The crackdown will continue until the end of June, according to NIA head Chiu Feng-kuang, who called on overstaying foreign nationals to turn themselves in soon as possible.
According to the NIA, a six-month voluntary program was introduced on Jan. 1 for overstaying visitors.
Under the program, overstaying aliens who surrender voluntarily will receive reduced punishment -- no detention, a maximum overstay fine of NT$2,000 (US$64) and a shorter reentry ban.
However, those who are arrested will face heavier punishment, including a fine of up to NT$10,000 and a longer reentry ban, according to the NIA.