People from Moldova, Vietnam and Ukraine are the most numerous illegal workers in the Czech capital, Prague, according to the online publication of the Prague Daily Monitor, Info-Prim Neo reports. Czech customs officers revealed that 709 foreigners, or nearly half of those checked in Prague, were employed without a valid work permit in 2010. The highest numbers of foreigner without a proper permit were employed by construction firms, restaurants, hotels and shops. In total, 1729 non-EU foreigners employed by 316 firms were checked last year.