Senior police officers have joined families of shooting victims at an anti-gun rally in London.
Toni-Ann and Bertram Byfield were shot in a north-west London bedsit
Some 120 people took part in the Not Another Drop protest, which paused outside the flat where seven-year-old Toni-Ann Byfield was shot dead in 2003.
She was killed along with Bertram Byfield, 41, the man she had thought was her father, in Harlesden, north-west London.
It is believed Toni-Ann was shot to stop her identifying the killer.
Patsy Hopwood, whose 21-year-old son Kavian Francis-Hopwood was shot dead on the Stonebridge Estate in 2003, was due to give a speech.
Brent's borough commander, Ch Supt Andy Bamber, said gun crime is down 7% in his borough but there are still too many weapons on the streets.
He told BBC News: "It's absolutely impossible to quantify the number of firearms that are available but what we do know is that people can easily get hold of a firearm.
"It's the age group of those who are becoming involved in firearms that is coming down and that is really alarming."
During Saturday's stop outside the flat where the Byfields were killed, Det Ch Insp Neil Basu, of Operation Trident, which investigates gun crime in the black community, addressed marchers.
The second stop on the march route was at the Jubilee Clock in Harlesden High Street where Brent South MP Dawn Butler was expected to be among the speakers.
The Not Another Drop campaign began in 1999 and was started by the police, local people and Brent council after a series of murders.