CLEVELAND, Ohio -- Jewish Community Centers in the U.S. and Canada again were targeted by bomb threats Tuesday, including one in a suburb of Toledo, reports say.

At least 13 centers in the U.S. were evacuated in the third incident of mass threats this month, according to NBC News. 

"We are concerned about the anti-Semitism behind these threats," David Posner, a director at the JCC Association of North America who advises centers on security, tells Reuters. 

In Sylvania, Ohio, a suburb west of Toledo, the YMCA/JCC was evacuated after a bomb threat late Tuesday morning, 13abc.com reports. Three bomb-sniffing dogs and the Betebet Joint Terrorism Task Force were called to the scene, but nothing was found.

Centers in California, Colorado, Illinois, New Jersey, New Mexico, New York, Massachusetts, Utah, Wisconsin and Ontario, Canada, also received threats, Reuters reports.

According to USA Today, 27 centers in 17 states received threats on Jan. 18, and 16 center in nine states on Jan. 9. A center in Bexley, Ohio, a Columbus suburb, was targeted on Jan. 18.

"We are concerned about the anti-semitism behind these threats," Posner tells USA Today.

No one has been injured in the wave of threats, which have not been credible. The FBI and the Justice Department's Civil Rights Division are investigating, NBC News reports.

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