The American Jewish community united in outrage Thursday, after the arrest of an American-Israeli teen who is allegedly responsible for many of the bomb threat phone calls made to Jewish community centers and organizations around the world. The suspect, a Jewish dual citizen of Israel and the U.S., was arrested on March 23 in the Israeli city of Ashkelon. He is suspected of using “advanced camouflage technologies” to disguise the origin of the calls.

American and Israeli Jews were quick to express horror at the arrest, and worry over what it may entail for future hate crimes directed against Jews. Users on Reddit’s r/Judaism board worried that the arrest of a Jew for threats against Jewish people would feed into the anti-Semitic narrative “that most anti-semitic attacks are false flags perpetuated by Jews.”

Jewish Twitter users were similarly outraged, claiming the accusation gives anti-Semites and conspiracy theorists ammunition.

Anti-Semites, alt-righters and xenophobes everywhere rejoice as misguided teen plants false flag. Nice job, kid. https://t.co/fFRqK5pvam — Oren Kessler (@OrenKessler) March 23, 2017

Yup. This guy just gave antisemites+conspiracy theorists ammo 4 saying antisemitic attacks r always false flags, done by Jews for attention https://t.co/WOHXNS1TKk — Arielle Zionts (@Ajzionts) March 23, 2017

Several Jewish groups and publications were highly disturbed by the Trump administration’s earlier suggestion that the bomb threats may have come from “the reverse” to “make others look bad.” President Trump did condemn the threats, stating that anti-Semitic attacks are “reprehensible,” however major Jewish organizations like the American Jewish Congress expressed dismay at Trump’s suggestion, urging the president to “clarify his intended meaning.”

Taking this into account, some fans of the president suggested that Jewish community leaders offer Trump an apology.

The Ultimate Self-Hating Jew, a19-yr old Israeli-American, was behind the JCC bomb threats. The US Jewish leadership owes @POTUS an apology — Marc Zell (@GOPIsrael) March 23, 2017