Indonesian immigration chief Hendarsam Marantoko said the government was reassessing visa waiver arrangements following a surge in cases involving foreign nationals allegedly engaged in cyber fraud, online gambling and other illicit activities.

Authorities last week detained more than 500 suspects in two separate operations targeting an online gambling syndicate in Jakarta and a scam network in Batam in the eastern Riau Islands province, officials said.

Those arrested included nationals from Vietnam, Cambodia, Malaysia, Laos and Myanmar, all of which currently benefit from Indonesia’s 30-day visa-free entry scheme. Chinese nationals were also among those detained, although China is not covered by the waiver policy.

“Cases of foreigners involved in illegal activities, including those coming from countries granted visa-free entry facilities, give rise to evaluation” of existing policies, Hendarsam said in a statement released by immigration authorities.

Investigators found that many suspects linked to the Jakarta gambling operation had entered Indonesia either under visa-free arrangements or through permits issued on arrival, according to officials.

Indonesia has intensified immigration enforcement in recent weeks as authorities seek to curb transnational cybercrime and illegal online betting operations, which have proliferated across parts of Southeast Asia.

Hendarsam said immigration authorities had conducted more than 6,700 administrative enforcement actions in recent weeks, including over 2,000 deportations and revocations of residence permits tied to immigration violations and criminal investigations.

Southeast Asian governments have faced mounting pressure to crack down on cross-border scam compounds and online gambling syndicates, many of which operate through regional networks involving foreign workers and digital financial transactions.

The suspects were detained at an office building in the Indonesian capital after police investigations linked the group to an online gambling enterprise that had allegedly operated for the past two months, officials said at a press conference.

According to Wira Satya Triputra, director of the Indonesian police force’s crime investigation unit, those arrested included 228 Vietnamese nationals, 57 Chinese citizens, 13 people from Myanmar, 11 from Laos, five from Thailand and three from Cambodia.

Wira said 275 of the detainees were being investigated under Indonesia’s criminal code provisions on gambling, which carry a maximum prison sentence of nine years. He added that most of the suspects were aware they had entered Indonesia to participate in online gambling activities primarily targeting customers outside the country.

Online gambling is prohibited in Indonesia, the world’s largest Muslim-majority nation, where authorities have stepped up enforcement efforts against digital gambling platforms and cross-border criminal syndicates amid concerns over financial fraud and illicit online operations.The arrests marked the second major enforcement operation involving foreign nationals in two days.

On Friday, Indonesian immigration authorities detained 210 foreigners on Batam island in Riau Islands province over allegations they were involved in online investment scams operating from an apartment complex near Singapore.

Interpol Indonesia official Untung Widyatmoko said there had been a recent shift in regional online gambling operations from Cambodian cities into Indonesia, reflecting changing enforcement patterns across Southeast Asia.

The latest raids underscore growing regional concern over organized cybercrime networks that have increasingly used Southeast Asian countries as operational hubs for online gambling, fraud and investment scams targeting international victims.