Foreigners who were already blacklisted and banned from re-entering Thailand have been caught at Suvarnabhumi airport thanks to biometric screening procedures, Immigration Bureau commissioner Pol Lt Gen Sompong Chingduang said on Monday, reported the Bangkok Post.Pol Lt Gen Sompong said at a press conference in Bangkok that the said the suspects had changed their names, surnames and passports to avoid being detected and that the airport's biometric screening system found they were blacklisted. He added that the 13 foreigners comprised one from Korea, four from China, one from Belgium, two from Egypt, two from Uzbekistan, one from Myanmar, one from India and one from Syria, added the newspaper.All 13 of them were arrested and prevented from re-entering the kingdom.