Aziz told his followers to “kill them in their own lands, behead them in their own homes, stab them to death as they walk their street thinking that they are safe,” according to authorities.
…Aziz was arrested in December on charges that he tried to help others travel to the Middle East to join fighters for Islamic State. The militant group controls territory in Syria and Iraq and has claimed responsibility for numerous mass killings, including the coordinated attacks in Paris in November that killed 130 people.
He used at least 57 separate Twitter accounts to advocate violence against U.S. citizens and to disseminate Islamic State propaganda, prosecutors said. Aziz served as an intermediary between a person living in Turkey and several members of Islamic State, according to court documents.
Prosecutors also said investigators found a “go bag” containing ammunition for an assault rifle, a black mask and a knife at Aziz’s house.