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)

A student holds a board reading 'Shame' as she marches to protest against under-resourced schools in Rennes, France, Tuesday, Oct. 13, 2026. (AP Photo/Jeremias Gonzalez)

Students chant during a march to protest against under-resourced schools in Paris, Tuesday Oct. 13, 2026. (AP Photo/Thibault Camus)