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US cautions Americans in UK to be alert after Britain raised threat level

By Thomson Reuters May 1, 2026 | 3:51 PM

WASHINGTON, May 1 (Reuters) – The U.S. embassy in London has cautioned Americans ​in the UK ‌to stay alert in public places, keep a low profile and review their personal ‌security ​plans after ⁠British government officials ⁠said earlier that they were raising the national terrorism threat to its second-highest ​level.

“The recent increase in terrorist threats is ⁠driven by ⁠a rise in Islamist ​and extreme right-wing terrorist ​threats in the UK,” the ‌U.S. embassy said in a security alert on Friday.

Britain raised its national ⁠terrorism threat level to “severe” from “substantial” on Thursday after an antisemitic ⁠stabbing ‌attack earlier in ⁠the week in north ​London.

The ‌threat level indicates ​that an ⁠extremist attack is highly likely within the next six months.

(Reporting by Jasper Ward and Kanishka Singh ​in Washington)