After Paris, a Global Wave of Terror Arrests | The Investigative Project on Terrorism

On Nov. 27, exactly two weeks after the terrorist attacks that killed 130 people in Paris, FBI agents swarmed into a private home in Harrisburg, Pa. Their target: 19-year-old Jalil Ibn Ameer Aziz, an American citizen and Muslim whom they’d been watching for several months, largely through his postings on Twitter. Using as many as 57 separate accounts, Aziz had pledged allegiance to the Islamic State, called for the killing of non-Muslims, aided others to make hijrah to Syria to join the jihad there, and expressed his own wishes to do the same.