Dangerous dogs are being traded for thousands of pounds as part of drug deals and debt payments by gangs.
One of the Capital's top police officers has said that we are "addicted to violence" at a Gang Culture conference in London today.
Police in Tower Hamlets have sent out more than 200 Christmas Cards to suspected gang members, urging them to turn away from crime.
Potential gang members are being offered lifesaving first aid lessons, so they can help with victims of attacks.
The classes are being taught by volunteer doctors and medical students.
The youths are learning techniques such as stemming blood-loss with a tourniquet, perhaps from a belt, so they can keep causality victims alive till medical help arrives.
The Street-Doctors group believes that they can equip them with skills to help prevent victims from dying.
Lupus Street - the road where the murder took place - is close to Pimlico Underground station and bordered by extensive council estates on one side and is home to Pimlico Academy.
A 58-year-old local resident said there had been two murders in nearby Gloucester Street in recent years and a stabbing of a boy in Lupus Street before Christmas.
"The violence that has started to occur around here is something else, it is frightening for all the residents," she said.
"You used to be able to walk around at night but I am starting to be very wary, especially at night-time."
Another resident, from nearby Peabody Close, said his friend had witnessed a gang made up of black and white teenagers carrying out the attack.
"He said they were carrying knives, some of them with wide swords. He said the victim was screaming and trying to get away," he said.
He said his friend told him that the gang had scattered and run off in different directions.
Politicians, youth leaders and those affected by violence have been meeting at a conference in London aimed at tackling gang culture.
As Liz Wickham found, it's thought the arrest of more than 200 gang leaders in the wake of the 2011 riots may have created a power vacuum, in which younger gang members have grabbed power, on a wave of violence:
Leading MPs will be calling on the Governement today to make changes to policies regarding youth gang culture.
The conference, Tackling Gang Culture, will look at whether Government strategy to remove gang leaders following the 2011 riots was counter-productive. It's thought it may have created a power vacuum in which younger gang members grabbed power on a wave of violence.
A total of 31 gang members have been jailed following an anti-drugs operation in Haringey.
Police seized crack cocaine, heroin and cannabis when they carried out co-ordinated raids in February and March.
All 31 defendants pleaded guilty at court hearings at Wood Green Crown Court between March and July 2012.
Following the sentencing of three men over the shooting of Thusha Kamaleswaran, Detective Superintendent Gordon Allison issued the following statement.
Police claim some of the most dangerous gang members in Hackney have now been taken off the streets after 29 people were jailed for a total of more than 71 years.
Undercover officers set up a mock fashion business to infiltrate two gangs known at the 'Pembury Boys' and the 'Balance Boys Gang'.
Among those convicted was a heroin dealer called Simeon Collins. He pleaded guilty to 13 different charges and was given a prison sentence of 6 years.