"This is a moment in time, in history, where forces of hate have been unleashed", de Blasio said.
The staff did not evacuate, given the widespread nature of the threats, said Robert Trestan, executive director of the league's Boston office, adding that Boston police responded and gave the all-clear.
On Friday, Missouri resident Juan Thompson was arrested on a cyberstalking charge and accused of making at least eight of the threats nationwide, including one to the ADL.
Since this trend began in January, more than 100 Jewish institutions have experienced bomb threats and multiple Jewish cemeteries have been vandalized.
There have been bomb threats aimed at Jewish centers in at least 16 cities across the country. CNN reports that centers in Atlanta, Boston, New York, Washington, Maryland, Milwaukee, and OR had threats against them.
A letter signed by all 100 USA senators was sent on Tuesday to top US law enforcement officials asking that they help Jewish groups enhance security. "We will update you when we return to normal operations, in the near future". Rep. Jan Schakowsky (D-IL9) condemned the bomb threat in a statement released late Tuesday morning.
Three Jewish institutions in MA, including two primary schools, were targeted Tuesday morning by a sixth wave of bomb threats that have affected more than 130 Jewish institutions across the United States since January.
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The senators expressed concern over rising anti-Semitism in the United States and an increasing number of threats against the Jewish community.
On Sunday, a caller to a Brooklyn's East Midwood Jewish Center left a voice mail promising to spray the temple with pig's blood, the Daily News reported.
The Anti-Defamation League said threats were also made in Oregon, Wisconsin, Illinois, Florida and Maryland. None of the threats have been substantiated, and it is unclear whether the calls are coordinated.
We will update this story if/when more information comes in.
In Chicago, police evacuated a Jewish grade school on the North Side because of a bomb threat Tuesday morning, authorities said.
Targeted were 96 institutions, a dozen Jewish day schools and two ADL offices.
"These are coming in at an unprecedented rate", said Bob Boyce, Chief of Detectives, New York Police Department, during an on-camera appearance with NYC Mayor Bill de Blasio and NYPD Commissioner James O'Neill at a JCC in Staten Island.