Within the past month, Jewish centers in 27 states have received bomb threats, forcing evacuations. The FBI is investigating and so far, no bombs have been found and the Jewish centers soon reopened to conduct business and services as normal.
The FBI is investigating another wave of bomb threats to Jewish facilities in the US after 11 sites were evacuated on Monday.
The latest threats bring the number of incidents to 69 in 27 states in the past month, according to the JCC Association of North America.
No bombs were found at any of the centres targeted with telephone calls.
Last week, 27 Jewish community centres in 17 US states reported receiving hoax bomb threats.
All of the threats made on Monday, along with previous incidents in January, turned out to be false and Jewish centres have since reopened with normal services resumed.