A U.S.-supported military offensive on the Islamic State (ISIS) militant group’s strategic hub in the Syrian city of Manbij has yielded a mother lode of more than four terabytes of data on the group’s foreign fighter network, Newsweek reported Thursday. The cache of information is the biggest data seizure from the radical Islamist group since the U.S. special forces raid on its finance chief Abu Sayyaf in May 2015, the report said. Manbij has been used as a landing and sorting station for many ISIS foreign fighters who are able to enter Syria from Turkey. The information garnered from the operation will allow coalition forces the ability to understand how ISIS’s foreign fighter network works...