A key member of the ShinyHunters hacking group, Saif al-Din Khader, was detained by Jordanian authorities earlier this week, three people familiar with the matter told Reuters. Two sources said Khader was cooperating with the FBI and global law enforcement to help locate other hackers in the group. The FBI declined to comment on any specific arrest or overseas activity, but said it was aggressively investigating the cyber incident allegedly involving ShinyHunters and had already worked with partners to arrest multiple subjects. Reuters could not determine the circumstances of Khader’s detention or his current whereabouts. The group, believed by experts to consist mainly of young, English-speaking hackers focused on data theft and extortion, has claimed to possess information on every FBI employee, prompting comparisons with the 2015 intrusion into the U.S. Office of Personnel Management.