Among those held, 14 foreign nationals aged between 26 and 77 were detained for carrying more than S$20,000 (US$14,700) in cash without declaring it, as required by law, according to The Straits Times.

Four received warnings, seven were fined a total of S$27,000, while the remaining cases are still under investigation.

Under the Corruption, Drug Trafficking and Other Serious Crimes (Confiscation of Benefits) Act, foreign visitors are allowed to carry up to S$20,000 without declaration. Exceeding this amount without reporting can result in a fine of up to S$50,000 or a prison sentence of up to three years.

Separately, 153 tourists were caught for failing to declare and pay Goods and Services Tax (GST) on items including tobacco products, alcohol, Pop Mart toys, and luxury goods, Asia One reported.

Under the Customs Act, those found guilty of fraudulently evading customs or excise duties may face a fine of up to 20 times the amount evaded, or imprisonment of up to two years.

Authorities have reminded travelers to declare and pay taxes on dutiable goods before entering Singapore.