A study by Tel Aviv University found anti-Semitic incidents dramatically increased across the world last year. The USA, Canada, Germany, Australia and the UK experienced the sharpest rise fuelled by radical left- and right-wing political movements and incitement on social media. The report's release coincides with Israel's Holocaust Remembrance Day, 28 April, commemorating the six million Jews murdered by Nazi Germany across Europe during World War Two. It is based on the analysis of dozens of studies from around the world, as well as information from law enforcement bodies, media, and Jewish organisations. Anti-Jewish hate crimes in New York and Los Angeles were almost twice that of the previous year. In France, anti-Semitic incidents increased by almost 75%. The gravest concern is the dark web, which shelters extremists. Anti-Semitic content is freely and openly spread, but is only accessible through special illegal browsing software.