A marauding attack

The BBC’s latest summing up:

Four people, including an armed police officer and a man believed to be the attacker, have died in a terrorist incident near the UK’s Houses of Parliament, Scotland Yard has said.

A woman was among several pedestrians struck by a car on Westminster bridge, before it crashed into railings.

The officer was stabbed in the Houses of Parliament by an attacker, who was shot by police.

At least 20 people were injured, including three other officers.

The French Prime Minister Bernard Cazeneuve said three French school pupils were among the injured and offered “solidarity with our British friends, and full support” for the wounded students and their families.

The Port of London Authority said a woman has been pulled alive from the River Thames near the bridge and was being treated for serious injuries.

It’s becoming familiar. One lonewolf drives a vehicle into a crowd and then if he’s still alive he attempts to pick off individuals. Dominic Casciani analyzes it:

The incident outside Westminster is exactly the kind of scenario that security chiefs have been planning for.

It looks like the type of attack jihadis have wanted to carry out in Britain – namely attacking people with a vehicle and taking on the security forces with knives.

In the security services’ jargon this is known as a “marauding attack” and is the hardest type of terrorist incident to predict and defend against. That means casualties, as we have seen in Nice and elsewhere, are inevitable.

The casualties are few in number, but people freak out anyway, because humans are bad at overall risk assessment.

This isn’t going to make things any better.

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