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
His mother Princess Diana was killed in a car crash in Paris in 1997 when he was just 12 and his brother William was 15.
The 21-year-old, who was arrested on Sunday, also allegedly injured two other people in the attack in the German city of Reutlingen.
She was going to the aid of a family member who got out of the car in the middle of the park and was dragged away by a different tiger.