Director General of MI5 Ken McCallum speaks at Thames House, the headquarters of the UK's Security Service in London, Tuesday Oct. 13, 2026. (Jonathan Brady/PA via AP, Pool)

Director General of MI5 Ken McCallum speaks at Thames House, the headquarters of the UK's Security Service in London, Tuesday Oct. 13, 2026. (Jonathan Brady/PA via AP, Pool)

Director General of MI5 Ken McCallum speaks at Thames House, the headquarters of the UK's Security Service in London, Tuesday Oct. 13, 2026. (Jonathan Brady/PA via AP, Pool)

Director General of MI5 Ken McCallum speaks at Thames House, the headquarters of the UK's Security Service in London, Tuesday Oct. 13, 2026. (Jonathan Brady/PA via AP, Pool)

Director General of MI5 Ken McCallum speaks at Thames House, the headquarters of the UK's Security Service in London, Tuesday Oct. 13, 2026. (Jonathan Brady/PA via AP, Pool)

A slider showing the reduction in air traffic around Riyadh after Houthi attacks on the airport. (AP Digital Embed)

FILE -A Visa sign is displayed on the front door of a local business, April 27, 2021, in Urbandale, Iowa. (AP Photo/Charlie Neibergall, File)

Greek antiquities dating to the 6th and 5th centuries B.C. are displayed during a repatriation ceremony at the National Archaeological Museum in Athens, Greece, Tuesday, Oct. 13, 2026, after 22 artifacts illegally removed from Greece were returned by Israel. (AP Photo/Thanassis Stavrakis)