The alleged attack had been planned in response to Quran burnings in Sweden.
The embassy, which has repeatedly urged all US citizens to leave Russia immediately, gave no further details about the nature of the threat.
Russia's FSB said that the members of the organization had been planning "to commit a terrorist act against one of the Jewish religious institutions in Moscow."
Hundreds gathered in solidarity against antisemitism at the site of the stabbing, the European Jewish Congress said.
The terrorists produced about 100 explosive devices with the help of videos they found online and directions provided by ISIS abroad.
Last week, Interior Minister Ali Yerlikaya said Turkey had detained 147 people suspected of having ties to Islamic State in operations across 33 provinces.
The woman disclosed that she endured rape and forced marriage to IS fighters before being transported to al-Hol in 2019.
The two main suspects were foreign nationals, one from Tajikistan and the other Russian, Interior Minister Ali Yerlikaya said previously.
The two had planned to detonate a car bomb full of gas tanks near the Knesset.
Professor of war explains the the key similarities and differences between Hamas and ISIS, to CNN.
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