Published June 9th, 2015 - 09:41 GMT Authorities in the US are investigating many cases of citizens suspected of travelling to, or intending on travelling to Syria. (AFP/file) Tags:WashingtonJerusalemIsraeli government LatestPopular Fashion craze? World's most expensive yellow plastic bag becomes a trend Simple tips to make your car's fuel last longer Video: Out of control robot destroys a restaurant Who is replacing Ali Larijani? Larger than Earth: Newly discovered 'liquid planet' triggers curiosity Loading content ... Subscribe Sign up to our newsletter for exclusive updates and enhanced content Subscribe Now Subscribe Sign up to get Al Bawaba's exclusive celeb scoops and entertainment news