The Director General of MI5, Andrew Parker, has warned about the risks of Islamists in the UK.
Addressing the Royal United Services Institute (RUSI), Mr Parker said:
Since 2000, we have seen serious attempts at major acts of terrorism in this
country typically once or twice a year. That feels to me, for the moment, unlikely to change.
While that tempo seems reasonably even, the ground we have to cover has increased as the threat has become more diversified.
The ability of Al Qaida to launch the centrally directed large scale attacks of the last decade has been degraded, though not removed. We have seen the threat shift more to increasing numbers of smaller-scale attacks and a growing proportion of groups and individuals taking it upon themselves to commit acts of terrorism. It remains the case that there are several thousand Islamist extremists here who see the British people as a legitimate target.
More top news
Britain's Heather Watson could face the game of her life after her second round Wimbledon win set up a possible match with Serena Williams.
Police have offered legal advice to anyone who spots a dog trapped in a hot car - including on whether they can smash the windows or not.
Sir Nicholas Winton, who rescued 669 children from the Nazis, didn't tell anyone about his exploits for 50 years - not even his wife.