PHILADELPHIA — Jewish centers and schools across the nation coped with another wave of bomb threats Monday as officials in Philadelphia began raising money to repair and restore hundreds of vandalized headstones at a Jewish cemetery.

Jewish community centers and day schools in at least a dozen states received threats, according to the JCC Association of North America. No bombs were found. Many of the buildings were cleared by Monday afternoon and had resumed normal operations.

It was the fifth round of bomb threats against Jewish institutions since January, prompting outrage and exasperation among Jewish leaders as well as calls for an aggressive federal response to put a stop to it.

‘‘The Justice Department, Homeland Security, the FBI, and the White House, alongside Congress and local officials, must speak out — and speak out forcefully — against this scourge of anti-Semitism impacting communities across the country,’’ said David Posner, an official with JCC Association of North America.

The FBI and the Justice Department’s Civil Rights Division are investigating the threats.

In Philadelphia, police investigated what they called an ‘‘abominable crime’’ after several hundred headstones were toppled during the weekend at Mount Carmel Cemetery, a Jewish cemetery dating to the late 1800s.

Police said the vandalism appeared to be targeted at the Jewish community, though they cautioned they had not confirmed the motive.

Associated Press