On July 18, an Afghan refugee named Riaz Khan (also known as “Muhammad Riyad”) assaulted passengers on a train in Würzburg, Germany with an ax and a knife. Nearly one week later, on July 24, a Syrian refugee identified as Mohammad Daleel blew himself up outside of a music festival in the German city of Ansbach. Approximately 20 people were wounded in the incidents. Amaq News Agency, a propaganda arm of the Islamic State, quickly issued claims of responsibility for the operations. Amaq also released videos from Khan and Daleel in which they swore allegiance to Abu Bakr al Baghdadi.…