On Tuesday, 31 alleged traffickers and 66 migrants were arrested in Hungary, France, Germany and the UK - in the fourth and biggest crackdown so far by European police forces on the illegal immigration of Vietnamese into the European Union.
With Hungary, Slovakia and the Czech Republic now all part of the Schengen group of countries, which have no border controls between them, migrants can reach the English Channel before being asked to show documents.
Some enter Schengen countries legally, on short-stay visas. Others cross illegally into Eastern Europe overland from Russia and Ukraine.
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