Police officers guard an entrance of the Federal Courthouse in New York's borough of Brooklyn where two of three Brooklyn residents, who have been arrested for plotting to join extremists fighting in Syria and two threatened to carry out attacks within the US, are arraigned before a judge on February 25, 2015. Abdurasul Hasanovich Juraboev, 24, Akhror Saidakhmetov, 19, and Abror Habibov, 30, have been charged with attempt and conspiracy to provide material support to a foreign terrorist organization. The teenage Saidakhmetov, a Kazakh citizen, was arrested Wednesday at New York's John F. Kennedy International Airport attempting to board a flight to Istanbul, before traveling onto Syria. US prosecutors said he recently expressed intent to buy a machine gun and shoot US police officers and FBI agents if thwarted in his plan to join the Islamic State (IS) group fighting in Syria. AFP PHOTO/JEWEL SAMAD        (Photo credit should read JEWEL SAMAD/AFP/Getty Images)