Going back to the controversial Liberty City 7 case, the FBI has made a number of these types of arrests. The Miami Herald mentions some of the convictions here:
In recent years, the U.S. attorney’s office in Miami has obtained convictions against Harlem Suarez, a Key West man who plotted to blow up a bomb on a public beach while supporting a foreign terrorist organization, and James Medina, a Hollywood man who tried to bomb a synagogue in Aventura. Suarez, 25, was sentenced to life in prison. Medina, 41, faces a 25-year prison term at his sentencing in November.