European officials say they are having trouble monitoring a growing roster of suspected extremists, as they try to zero in on which radicals pose the greatest threat and prevent them from committing terrorist acts.
WSJ.com: World News, Wall Street Journal: World
Fri, 03/24/2017 - 5:30am
European officials say they are having trouble monitoring a growing roster of suspected extremists, as they try to zero in on which radicals pose the greatest threat and prevent them from committing terrorist acts.