Anti-gun campaigners took to the streets of Upper Norwood to protest about the murder of Jordan Jackson and Leyla Djemal- Northcott.

Last month the young couple were slain by gunmen in the flat they only recently moved into.

On Saturday more than 200 protesters gathered at Menlo Gardens where Jordan and Leyla had moved in together months before their murder and marched to West Norwood, carrying banners telling gunmen that "enough is enough".

Leroy Jackson, the anti-gun campaigning uncle of Jordan, made an emotive appeal for those who know the killers to come forward.

"Everyone has a conscience. To those who know the truth and don't come to speak the truth, then the blood is on their hands," he said.

"It went very well, the message went out that now is the time for change," explained Mr Jackson, managing director of Save Our Souls (SOS) a Norwood-based youth group which organised the march and warns youngsters of the perils of guns and drugs.

SOS was set up in 2003 following the murder of 25-year-old Andrew Sams. Andrew's mum Olivia attended the march, joining Stanley Smith, dad of Matthew Smith, 21, who was allegedly shot dead in Streatham for a mobile phone in January and Blacker Dread, father of Solomon Martin, 24, who was shot dead on New Year's Eve 2004.

"People even came out of their houses, shut their doors and joined the march," Mr Jackson said, "This is about them, the community, to wake up about what's happened.

"Don't wait for death to come knocking on your door, take part now."

SOS runs workshops at schools, colleges and inclusion programmes in a bid to steer young people away from so-called gangster culture and gun crime.

Mr Jackson explained: "We're not saying we're going to reach every young person but there are those we believe we can turn around and those who we believe if we intervene at early stages, we can change their role models."

On March 7 Jordan, 20, and his girlfriend Leyla, 21, were shot dead in a seemingly motiveless attack by two masked gunmen.

Jordan's twin brother Kieran was shot in the head and hands and has since been released from hospital. His girlfriend was uninjured.

One of the gunmen is described as a dark-skinned black man, around 6ft, wearing dark clothing.

His accomplice was described as a lighter-skinned black man, around 5ft 4in to 5ft 5in, wearing dark clothing.

Police said two men matching the description of the suspects were seen in the vicinity of Menlo Gardens shortly before the attack took place.

Three men have been arrested in connection with murder, all have been bailed pending further enquiries.

Anyone with information should call the incident room on 020 8247 4553 or Crimestoppers anonymously on 0800 555 111.

SOS is looking for individuals and companies like Travis Perkins which Mr Jackson said "bent over backwards" for the cause to make donations to support them in the fight to discourage children from gun crime.

If you can help, call organisers on 07956 968341, 07946 809 049, or 07956 854503.