In Los Angeles, a man screaming "kill Jews" attempts to break into a family's home. In London, girls in a playground are told they are "stinking Jews" and should stay off the slide. In China, posts likening Jews to parasites, vampires or snakes proliferate on social media, attracting thousands of "likes."

These are examples of incidents of antisemitism, which have surged globally since the attack by Hamas gunmen on southern Israel on Oct. 7 and subsequent war on the Islamist group launched by Israel in the Gaza Strip.

"This is the scariest time to be Jewish since World War II. We have had problems before, but things have never been this bad in my lifetime," said Anthony Adler, 62, speaking outside a synagogue where he had gone to pray in Golders Green, a London neighborhood with a large Jewish community.