"wave of threats" . . . . . . "2017 Jewish Community Center bomb threats" . "Jewish Community Center bomb threats in 2017" . . . "2017 Jewish Community Center bomb threats" . "over 100 JCCs received bomb threats" . "bomb threats to Jewish community centres" . . "bomb threats made against Jewish Community Centers" . "increase in vandalism and bomb threats at Jewish community centers" . "a wave of threats" . . "various bomb threats against Jewish facilities" . "several bomb threats" . .