JTA — Police in at least three European countries have arrested people they said were threatening or planning terror attacks related to the Israel-Hamas war. The arrests come amid a global spike in antisemitic incidents following Hamas’s Oct. 7 attack on Israel that has spurred an ongoing Israeli military response in Gaza. While police have offered widely ranging levels of detail about the threats they said they interrupted, they believe Israelis were possibly the intended targets of multiple plots. In Duisburg, a German city of about 500,000 located near the Netherlands border, a man previously convicted of terrorism was arrested...