Police have been heckled outside the Royal Courts of Justice following the verdict on the death of Mark Duggan.
A jury found that Mr Duggan was lawfully killed by armed police officers in a shooting that sparked riots across England.
The Met Police Assistant Commissioner Mark Rowley addressed reporters over calls of "murderer" from the crowd, telling them that officer V53 "had an honest and reasonable belief that Mark Duggan still had the gun when he shot him".
He said: "No officer sets out at the start of the day to run an operation that results in someone dying.
"So our sympathy today is with Mark Duggan's family. They have lost a loved one.
"But the task our officers face in making split-second decisions when confronting armed criminals means there is a risk - a very small risk - that this will happen.
"Armed criminals have shot dead more than 50 people in London in the last three and a half years. We send out well-trained, professional armed officers thousands of times a year to combat this threat, only firing shots once or twice."