The Anti-Defamation League's national headquarters in New York on Wednesday was hit with an anonymous bomb threat. Although the specific nature of the threat is unknown, ADL CEO Jonathan Greenblatt said it is being taken "very seriously." It has yet to be determined if it is connected to the recent increase in threats targeting Jewish community centers across the country. "This is not the first time that ADL has been targeted, and it will not deter us in our efforts to combat anti-Semitism and hate against people of all races and religions," Greenblatt said in a statement.