Next 9/11 shock might be being planned where we're not looking, UK's MI5 chief says ↧ ↧ Next 9/11 shock might be being planned where we're not looking, UK'... Intelligence services must not dwell too much on past threats but accept that a new strategic shock along the lines of the 9/11 attacks could already ​be in preparation where they are not looking, the head of Britain's ‌MI5 spy agency said.