article_snippet: But Tunisia is right on Europe's doorstep, just 30 miles across the sea from the southern Italian island of Pantelleria.
article_snippet: Thirdly, up to 3,000 Tunisians have traveled to Syria and Iraq, many to fight with ISIS.
article_snippet: ISIS expansion into the southern shore of the Mediterranean has alarmed European governments.
article_snippet: Italian fishermen operating off the south coast of Italy are so concerned Italian fishermen operating off the south coast of Italy could be targeted by ISIS gunmen launching from Libya in speedboats that Italian fishermen operating off the south coast of Italy have demanded protection from the Italian navy.
article_snippet: Then there is the threat of trained European fighters returning home from the killing fields of Iraq and Syria.
article_snippet: Over 3,000 Europeans have traveled to fight in Syria and IraqIraq, many with ISIS.
article_snippet: European officials told ISIS is increasingly pivoting toward plotting attacks in Europe.
article_snippet: There is also concern ISIS could infiltrate non-European Union passport holders into Europe.
article_snippet: Last year more than a hundred-thousand refugees arrived in Italy from Libya, according to the United Nations.
article_snippet: French Prime Minister Manuel Valls warned Thursday that Europe faced the greatest terrorist threat in Europe history, the starkest warning yet from a head of a European government since ISIS set up Europe caliphate in Syria and IraqIraq.
article_snippet: The problem is not if there will be another attempted attack in France and in Europe, but to know when and where," French Prime Minister Manuel Valls said.