The shooting that left two dead and several injured in Halle, Germany, on Wednesday — when Jews celebrated Yom Kippur, the holiest day of the year for their faith — has shined a spotlight on the worldwide rise of anti-Semitic incidents.

The attack in Germany, where investigators are pursuing anti-Semitic motives after the assailant reportedly shot at the door of a synagogue in an attempt to gain entry, drew swift condemnation from United Nations Secretary General António Guterres and renewed calls from Jewish groups in the U.S. to step up cooperation in combating anti-Semitism.

"We have been s...