From the Associated Press:
Amsterdam's mayor says he has ordered extra security measures at the
city's Jewish schools, synagogues, and monuments — including the Anne
Frank House — on the advice of the national anti-terrorism office.
In a letter to the city council, Eberhard van der Laan said he is not
aware of any concrete threat to Jewish places of interest, but an
attack is "conceivable" following an attack on the Jewish Museum in
Brussels, Belgium, last month which left three people dead.