There was also a message from Prime Minister Tony Blair, who said in a letter that he would not rest until the gun criminals were brought to justice.
Singer Beverley Knight was also there, and she said the government was being "irresponsible and misguided" in the way they linked music to gun crime.
Music stars under attack
Earlier in January the home secretary David Blunkett and other politicians attacked musicians who made music that made guns and violence look cool.
Charlene's mum also read out a poem, and spoke of forgiveness and love in her tribute for the two girls.
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