Anti-Semites struck for the second time in two weeks Friday and attacked the synagogue in the Swedish city of Malmo, which has suffered a steady exodus of Jews because of anti-Semitism.

A written bomb threat had been taped to the synagogue Friday, when an explosion shattered three window panes but caused no injuries. Security at the synagogue was beefed up following the attack. An explosion also struck the house of worship two weeks ago, without causing injuries.

Despite violent demonstrations in March when an Israel tennis time played in the Davis Cup in Sweden, Jewish community president Fred Kahn said, “We thought we were finished with this sort of thing. It’s incredibly sad that this should happen again.”

Swedish police arrested 10 rock-throwing attackers in the March violence, which succeeded in forcing the banning of spectators at the tennis match.

Anti-Semitism in Sweden was fueled last year, when a local journalist published claims that Israel soldiers harvested organs of Palestinian Authority terrorists.

The CAMERA (Committee for Accuracy in Middle East Reporting in America) media watchdog reported last Friday, “The plight of Jews in Malmo, Sweden. Jews are fleeing Malmo in droves as anti-Semitic attacks, perpetrated mostly by Muslim immigrants have increased substantially. Malmo’s mayor has failed to stop the attack, stating they are merely a consequence of Israeli policies in the Middle East.”

The Swedish English-language newspaper The Local reported that the number of anti-Semitic crimes reported in Sweden rose 57 percent last year.