The number of priority areas for stemming youth violence will be extended to include the home borough of an 18-year-old who was stabbed to death this time last year.
Seydou Diarrassouba, of Mitcham in south-west London, died after being stabbed twice during last year's Boxing Day sales in a branch of Foot Locker on Oxford Street.
Under new plans announced by the Home Office, frontline teams will cover Hammersmith and Fulham, Leeds and Merton in addition to the 29 other priority areas.
More top news
A newly promoted police officer caused a sensation with local women on Facebook
Ex-London mayor Ken Livingstone says he is sorry for the "disruption" caused by his comments that Adolf Hitler was a supporter of Zionism.
Kickstarter group asks for public donations to fund replacing Tube ads with pictures of cats