Taser
A man was Tasered and arrested during the incident in Hendon.
“It is a very powerful bit of kit, it is also potentially a very dangerous bit of kit. You’ve got to be a really good decision-maker, you’ve got to be really fit.”
The male officer, who was stabbed multiple times in "sudden and brutal attack", used a Taser to subdue the suspect.
Investigators admit incident not recorded by force.