Police have released images of seven people they are trying to find after a man was stabbed and left with a partially severed ear during an attack in Wembley.
The victim, aged in his 20s, had been sitting on a wall drinking with friends on Cecil Avenue at about 21:15 GMT on 15 March when he was set upon by a large group.
The Met said he had been "struck with various objects" and was taken to hospital to be treated for several injuries.
Det Con Marcus Furneaux-Harris said the attack was "seemingly unprovoked" and it was "only by sheer luck that he [the victim] was not more seriously hurt".
"I am appealing to anyone who recognises the people shown in these images to contact police,” he added.