The incidents are the fifth wave of such threats in less than two months.

Among the affected JCCS are Asheville, North Carolina, and Davie, Florida, both of which were evacuated to local churches, as well as JCCs in York and Harrisburg, Pennsylvania; Indianapolis; Tarrytown, New York, and in Delaware. The upper school of the Charles E. Smith Jewish Day School in Rockville, Maryland, and the David Posnack Jewish Day School in Davie also received bomb threats.

#BREAKING JCC in Davie being evacuated, police on scene after school reportedly receives bomb threat @WPLGLocal10pic.twitter.com/ZXUuJiWAB8

— Erica Rakow (@EricaRakow) February 27, 2017

Paul Goldenberg, director of the Secure Community Network, told JTA shortly after reports of the bomb threats began coming in that his organization was working closely with the Department of Homeland Security and the FBI to identify the perpetrators and stop the threats. SCN is an affiliate of the Jewish Federations of North America that advises Jewish groups and institutions on security. SCN also is working closely with the Anti-Defamation League, Goldenberg said.

Calling the continued threats “disturbing,” he said they are “impacting the lives of our communities out there.”

Goldenberg also said the Jewish institutions are “behaving in an exemplary manner” in the wake of the threats.

“Our Jewish schools and our JCCs continue to train for this, continue to execute well-placed measures,” he said, going on to praise the staffs of U.S. Jewish institutions as being “vigilant.”

No actual bombs have been found at any of the dozens of institutions that have received bomb threats in recent weeks.

“The goal of these people is to wear us down,” Goldenberg said. “But we are back in our schools, we are back in our JCCs.”

Some 60 JCCs and Jewish schools have received nearly 70 bomb threats since Jan. 9, forcing the evacuation of hundreds, including preschool children, from the buildings.