Many Jewish organizations had blamed far-right extremists for the threats that have plagued Jewish institutions since the start of 2017.
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The office refuted an Israeli newspaper report that the envoy clearly said the Trump administration wants substantial restrictions on construction.
The longtime Trump lawyer had outraged some groups with his broadsides against liberal Jews.
British authorities are calling the Wednesday afternoon attack a "terrorist incident" as they continue to investigate the slain assailant's motive.
The 30-day period between Purim and Passover is often fraught, especially for Jews.