Greenblatt also said that the ADL is "working with law enforcement to determine if it is connected to similar threats to Jewish institutions across the country".
On Wednesday, the Anti-Defamation League (ADL) received a bomb threat to its NY headquarters, also the headquarters of Univision properties including The Root, making this the latest in a recent series of threats against Jewish organizations.
Greenblatt said the incident won't deter the ADL's mission to combat anti-Semitism and "hate against people of all races and religions".
Chicago Police Hope Surveillance Footage Solves Shooting of Two Girls
The 11-year-old is a cousin of well-known community activist Andrew Holmes . Twenty-three others were shot in shootings that resulted in five deaths.
In a statement, Cuomo said the threat was "unacceptable" and "un-American".
Anti-Defamation League CEO Jonathan Greenblatt said the organization received the threat at its offices in New York City. "This is now a national crisis as a troubling pattern of recent anti-Semitic threats have been directed at Jewish Community Centers on a regular basis".
The Anti-Defamation League has been tracking anti-Semitic incidents since 1979. The group, according to its website, "fights anti-Semitism and all forms of bigotry, defends democratic ideals and protects civil rights for all".
Missing 150-year-old wedding dress found after Facebook appeal
Tess was the last person to wear this antique lace gown when she married husband Alfred Newall , 30, in June 2016. She said she still planned to have the dress cleaned, but probably at a lace specialist in London .
On Tuesday, the ADL called for Attorney General Jeff Sessions to open an investigation into bomb threats targeting Jewish institutions.
"The anti-Semitic threats targeting our Jewish community and community centers are frightful and are painful and a very sad reminder of the work that still must be done to root out hate and prejudice and evil", the president said. "We stand with all Jewish people here in NY and across the country to say loud and clear - enough is enough".
Clemson associate AD Bert Henderson found dead
Henderson was reported missing late Monday afternoon, after Clemson officials noted the 60-year-old did not show up for work. Henderson's Clemson bio provides more details about what his specific roles were within the school's athletic department.