 "London")
It was July 7, 2005, that four Islamist extremists set off three bombs on the London Underground and another on a double-decker bus, killing 52 people, wounding more than 700 others and searing the date so deeply into the British psyche that it became known simply as 7/7.
Since then, the U.K. has been spared a major act of terrorism and staged Summer Olympic Games without incident, even as cities such as Paris, Brussels and Baghdad have been convulsed by spasms of terrorist violence.
Throughout the hiatus, senior U.K. counterterrorism and intelligence officials cautioned that it wouldn’t last, and on
