Call to detect false Syrian passports comes after two of the suicide bombers in the Paris attacks were found to be carrying such documents.
Officials say the move, carried out under new counter-terrorism laws, came amid fears the men wanted to join Islamic State.
While the European Union is placing increased resources into blocking clandestine immigration to the continent, its member states, notably those of the south, worst-hit by the financial crisis, are mounting schemes to sell residency rights and even citizenship to wealthy non-EU foreigners in an attempt to attract millions of euros into state coffers. To qualify for most of the schemes it suffices to buy into luxury property, a deal which is notably attracting Russian, Chinese and Middle East investors. The European Commission, meanwhile, says it has no say in the cynical and apparently legal business of selling European citizenship. Ludovic Lamant reports.