Islamist militants are less capable of organising plots on the scale of 9/11 but small groups of jihadists returning from Syria pose a grave threat to British security, the country’s two most senior counter-terrorism officers said on Thursday.
Every year, Britain’s security services are faced with at least one plan to carry out an attack on the level of the July 7, 2005 suicide bombings on London, known as the 7/7 attacks, which killed 52 commuters, the officers said.