The US embassy in London has warned Americans to "exercise increased caution" near Jewish and American sites in the UK and Europe due to a rise in threats. The warning follows a series of recent antisemitic attacks in the U.K. and Europe, including an arson attack on four ambulances linked to Jewish charity in London, an attack on the Kenton United Synagogue in London and a March explosion at a Jewish school in Amsterdam. The embassy has advised Americans to remain alert while visiting tourist and expat areas, houses of worship, and to check local media for updates.