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Sixty thousand people have crossed the Mediterranean and made it to Europe so far this year.

Frontex, the EU border agency, warns that between 500,000 and 1 million people - Eritreans, Syrians, Afghans, Somalis - could be waiting to leave the shores of Libya for Italy.

Its latest report says resources are being devoted to migrants' care but not towards screening and collecting basic information such as their nationality - which means many are quickly moving on to countries like the UK. According to the report, 'this puts the EU internal security at risk'.

There are also fears terrorists belonging to the so-called Islamic State could secrete themselves among the migrants.

So how easy is it for people to avoid security checks as they journey across the EU?

European countries are supposed to stop illegal migrants and enter their fingerprints and details on a central database. EU rules state that the country where people are first fingerprinted must look after them and consider their