We have no alternative but to work together to defeat the men of violence

Lee Jasper, Trident Independent Advisory Group

Ms Paris said: "We have to work together as a community to help resolve this problem."

Her brother Jason Phillips died on Valentines Day after he was gunned down outside a house in Shirley, near Croydon, south London.

Ms Paris was joined by Lee Jasper, the chair of the Trident Independent Advisory Group, which works with the police on the problem.

Speaking at the campaign launch at New Scotland Yard, Mr Jasper said: "Operation Trident represents a genuine effort by the black community and the Metropolitan Police Service to tackle serious gun crime linked to crack cocaine gangs operating in London.

Trident is cracking down on black shootings

"We have no alternative but to work together to defeat the men of violence."

Posters and fliers will be going up across Brent, Hackney, Haringey, Lambeth and Southwark, to publicise the campaign

Deputy Assistant Commissioner Mike Fuller, head of the Met's Trident Operational Command Unit said the campaign will play a big part in the force's work to tackle the problems.

"The police have worked with the community, and with young people in particular, to develop this eye-catching and powerful campaign, which adopts a dramatic style to reach a younger audience," he said.