The warning follows an announcement by the Immigration Bureau, operating under the Royal Thai Police, outlining the results of its proactive ‘3 No’s’ measures: ‘No Entry, No Stay and No Escape’.
According to the bureau, the campaign is being implemented under the policy of Royal Thai Police Commissioner-General Pol Gen Kittiratt Panphet, who has directed police nationwide to target transnational criminal activity and foreigners posing as tourists while engaging in activities that affect national security, the economy and society.
Deputy Immigration Bureau Commissioner and bureau spokesperson Pol Maj Gen Cherngron Rimphadee said Immigration Bureau Commissioner Pol Lt Gen Panumas Boonyalak had ordered all immigration divisions across the country to strictly enforce the measures throughout 2026.
Under the first measure, ‘No Entry’, authorities use the Advanced Passenger Processing System (APPS) to prevent blacklisted foreigners from entering Thailand. The system currently contains records for 169,506 individuals, including foreigners previously imprisoned in Thailand and persons wanted under Interpol arrest warrants.
Those listed are prevented from boarding flights bound for Thailand, while travellers attempting to enter through land border checkpoints are denied entry.
The Immigration Bureau reported that, overall, 29,993 foreigners were denied entry to Thailand between Jan 1 and May 31 this year under the ‘No Entry’ measures.
Immigration officers are also conducting interviews with visa-exempt travellers and other arrivals deemed to present a risk to public order, including individuals suspected of intending to work illegally or become involved with criminal networks such as scam operations.
The second measure, ‘No Stay’, focuses on removing foreigners who violate immigration regulations or misuse their visas.
Authorities have revoked visas held by foreigners found to be engaging in activities inconsistent with their visa conditions, including cases involving student visas where no actual study was taking place, explained the notice.
From Jan 1 to May 31, 2026, immigration officials revoked the permits-to-stay and deported 668 foreigners. During the same enforcement campaign, authorities carried out inspections and coordinated raids nationwide, resulting in the arrest of 14,161 foreigners for immigration and related offences between Jan 1 and Apr 30, 2026.
The final measure, ‘No Escape’, requires immigration offices nationwide to identify high-risk targets and share intelligence with local police for joint investigations and enforcement operations.
Between Jan 1 and May 31, 2026, immigration authorities investigated foreign communities in several provinces where residents were suspected of behaviour that could threaten public order.
A total of 190 targets were identified, including 147 in Chonburi, 22 in Surat Thani, 10 in Phuket, nine in Chiang Mai and two in Mae Hong Son.
The subsequent operations led to the arrest of 31 offenders, while investigations into the remaining targets are continuing, the notice explained.
Pol Maj Gen Cherngron said Pol Lt Gen Panumas had instructed immigration commanders nationwide to continue implementing the measures and closely monitor results.