Jews, Israelis fear fallout from bomb hoax arrest

Israel's arrest of a Jewish teenager accused of masterminding dozens of anti-Semitic threats could encourage racism and ease pressure on US President Donald Trump to tackle anti-Semitism, Jewish groups have warned.

Far-right groups claimed vindication that attacks previously blamed on rightwingers and alleged hatred resulting from Trump's election may actually have been carried out by a young Jewish American Israeli.

Jewish organisations and Israeli media said the arrest was likely to boost conspiracy theories, while others worried it would weaken responses to a rise in anti-Semitic attacks in the US.

More details emerged Friday about the suspect, who holds dual Israeli American citizenship, though identifying details are subject to a gag order.