Ten foreigners were arrested during searches in 45 areas of Bangkok in what police have called their "Black Eagles" operation late Wednesday night.
The operation was led by Pol Maj-General Surachet Hakpal, deputy commissioner of the Tourist Police Bureau, with officers from the tourist police, Narcotics Suppression Bureau, Immigration Bureau and Patrol and Special Operations Division.
At the end of the operation, Surachet held a press conference at 1am on Thursday at the Nana Hotel on Sukhumvit Soi 4 in Klong Toey district to announce the results.
The operation netted a Nigerian and Ghanaian man for having entered the country unlawfully, Surachet said.
Two Indians, two Nigerians and two Ugandan tourists were arrested for overstaying their tourist visas, he added.
A Kenyan man was arrested for working without a permit and a Ugandan man was arrested in possession of drugs.
Surachet added that 32 foreigners had been detained pending DNA tests.
He said the "Black Eagles' operation had been carried out in areas frequented by foreigners to prevent crime and create confidence among foreign tourists.