The EU's anti-terror chief has told the BBC that hundreds of Europeans are now fighting with rebel forces in Syria against Bashar al-Assad's regime.
Gilles de Kerchove estimated the number in Syria at about 500.
Intelligence agencies are concerned some could join groups linked to al-Qaeda and later return to Europe to launch terrorist attacks.
The UK, Ireland and France are among the EU countries estimated to have the highest numbers of fighters in Syria.
Source: BBC. Read full article. (link)