Weiss mentioned that the email provided a phone number for further information.
The threat claimed bombs had been planted in the school parking lot. Its subject line was “Death by fire.”
The following day, an inert grenade was found at Holocaust Memorial Park in Sheepshead Bay, Brooklyn, and a false bomb threat was called into Central Synagogue in Midtown Manhattan.
According to senior sources in the organized Jewish community, who spoke to The Jerusalem Post, "there was a bomb threat towards many Jewish schools."
The US embassy said it is back to normal operations on Wednesday afternoon.
The German air force said on its X social media account that it escorted the plane after it entered German airspace east of Berlin due to a bomb threat.
Since the summer, dozens of Jewish institutions across America have been targeted with fake bomb threats, according to the Anti-Defamation League.
The FBI says Nunez Santos, who is Peruvian, embarked on the bomb threat spree after asking teen girls to send him pornographic pictures of themselves and being rejected.
The war relic, which was unearthed last week, had been deemed unsafe to move and hence had to be disposed of on-site by the military.
Bomb threats have been plaguing synagogues in the US since the summer, but all the threats on Rosh Hashanah were deemed not credible.