The U.S. embassy in London on Friday warned Americans to “exercise increased caution” while visiting Jewish and American areas in the U.K. and in Europe because of a recent rise in threats.

“The U.S. Embassy in London notes recent attacks and threats targeting Jewish and American institutions in the United Kingdom and Europe,” the alert said. “U.S. citizens, particularly those visiting institutions serving Jewish or American interests, should remain alert and exercise increased caution.”

The embassy further advised Americans to remain alert while visiting tourist and expat areas and houses of worship, review personal security plans and to check local media for updates.

Concerned citizens can also enroll in the State Department’s Safe Traveler Enrollment Program (STEP) to receive travel and security updates.

NRA FORGES HISTORIC PARTNERSHIP WITH JEWISH GROUP AMID RISING ANTISEMITISM

The advisory followed a series of recent antisemitic attacks in the U.K. and in Europe, including an arson attack on four ambulances linked to Jewish charity in London on March 23, an April 18 attack on the Kenton United Synagogue in London, and a March explosion at a Jewish school in Amsterdam that authorities called a “targeted attack against the Jewish community.”

No one was injured, but the school was damaged.

ANTISEMITIC ATTACKER FACED 30-YEAR SENTENCE, GETS LESS THAN 1½ YEARS IN PLEA DEAL

U.K. authorities are investigating whether “thugs for hire” backed by Iran are instigating the attacks in London, GB News reported.

Prime Minister Keir Starmer told the Jewish Chronicle: “In relation to malign state actors more generally, proscription, we do need legislation in order to take necessary measures, and that is legislation that we’re bringing forward as soon as we can.”