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At the time of writing, however, there was no official claim of responsibility. Attacks organised and inspired by Isil are usually not claimed within the first 24 hours.
Motivations of the attacker are not yet known, but the use of a vehicle as well as a knife are consistent with instructions for attacks issued by Isil and are similar to the group's attack on a Christmas market in Berlin and in Nice, which left more than 80 dead.
Abu Mohammad al-Adnani, the late Isis spokesman, instructed European followers to carry out attacks at home in an audio message released after the declaration of its so-called caliphate.
"If you are not able to find an IED or a bullet, then single out the disbelieving American, Frenchman, or any of their allies. Smash his head with a rock, or slaughter him with a knife, or run him over with your car," he said.
7. This is 1 of the enigmas in terrorism studies: England has sent 1 of highest numbers of fighters to ISIS outdone in Europe only by France
The UK is second only to France in the number of fighters it has sent from Europe to Syria and Iraq. But until now Britain has been spared the deadly attacks seen by countries like France, Belgium and Germany.
Harry Sarfo, a German Isil fighter educated in England who is serving a sentence for terror offences, said the jihadists had trouble recruiting people for attacks in the UK.
Image 1 of 16: Police forensic officers at the scene close to the Houses of Parliament in London. Photo / AP