Metropolitan Police Deputy Assistant Commissioner Patricia Gallan is leading the investigation, dubbed Operation Alice.
Assistant Commissioner Ian Johnston, ACPO's spokesman on missing persons issues, welcomed the new initiative.
Deputy Assistant Commissioner Patricia Gallan also did not promise the parents concerned would be informed.
BBC: Dead child identities: Met officer refuses to apologise
Met Police deputy assistant commissioner Brian Paddick met community leaders in Stockwell to discuss the shooting.
Assistant Commissioner Les Green from the Jamaica Constabulary Force says the scam is linked to other crimes.
No mention was made about their predecessors who include Sara Putnam, the Assistant Commissioner of Tax Exempt Entities.
This time, John Yates, an assistant commissioner in charge of the investigation to date, won't be heading it.
Attending the event were DeAdrian Maddox, USDA, Angela Olige, Texas Department of Agriculture assistant commissioner, Eddie Lucio Jr.
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Mr Ghaffur is taking legal action against Sir Ian and a junior colleague, Deputy Assistant Commissioner Richard Bryan.
The BBC understands the other two are former Assistant Commissioner Andy Hayman and former Deputy Assistant Commissioner Peter Clarke.
Metropolitan Police Assistant Commissioner Tarique Ghaffur praised the public for "showing such resilience during this challenging time for London".
"The Tory machinery and their press friends are mobilised against this investigation, " the Metropolitan Police assistant commissioner told reporters.
The other men under investigation include Commissioner Sir Paul Stephenson and Assistant Commissioner John Yates, who both quit this week.
Scotland Yard Assistant Commissioner John Yates has expressed "extreme regret" for not reopening the phone hacking investigation two years ago.
But IRS Assistant Commissioner Thomas Wilson told FORBES that this is an area where the IRS may need to change.
Committee chairman Keith Vaz pressed the deputy assistant commissioner for an apology to the parents whose children may be involved.
BBC: Dead child identities: Met officer refuses to apologise
But James Kabogoza, assistant commissioner of Children's Affairs for the Ugandan Government, feels that Ugandan children should stay in Uganda.
Assistant Commissioner Andy Hayman told the inquiry that the force "got caught in the headlights and frightened to say anything".
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Met Deputy Assistant Commissioner Steven Kavanagh said it was a "shocking and appalling morning for London to wake up to".
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In a statement, Assistant Commissioner Simon Byrne said police were on the scene nine minutes after receiving the first emergency call.
Metropolitan Police Deputy Assistant Commissioner Brian Paddick said the initial estimates were of 150 seriously injured and "many more" walking wounded.
The inquiry has been transferred to the Met's specialist crime directorate and will be led by Deputy Assistant Commissioner Sue Akers.
Assistant commissioner of police Rajinder Singh said Mr. Singh's body had been moved to a nearby hospital for a post mortem.
The claim is in documents handed to an employment tribunal into Assistant Commissioner Tarique Ghaffur's claims of racial and religious discrimination.
Former Met assistant commissioner Stephen House applied for the job after Home Office officials contacted him, says BBC correspondent Danny Shaw.
The concerns of other minority police groups follow those expressed by the Met's Assistant Commissioner in charge of human resources, Bernard Howe.
The Met's Deputy Assistant Commissioner Steve Kavanagh has admitted there were not enough police to deal with the three days of rioting.
Mr Fahy said he had the "highest regard" for Sir Paul and Assistant Commissioner John Yates, who also resigned over the issue.
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The father-of-two was previously a deputy assistant commissioner with the Metropolitan Police.
Searches have been carried out at several locations in connection with the slaying, Assistant Commissioner for Specialist Crime and Operations Mark Rowley said.
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