Toni-Ann with the man she thought was her father, Bertram Byfield

Toni-Ann was shot alongside Bertram Byfield, 41, the convicted crack dealer she thought was her father, at his London flat in September last year.

An independent review has criticised Birmingham's social services officers and the immigration service.

It also condemned the Child and Family Courts Advisory and Support Service.

Toni-Ann was under the care of Birmingham social services when she was shot dead - prompting a major review of her case.

Peter Hay, Strategic Director of Social Care and Health at Birmingham City Council, apologised for "serious shortcomings and mistakes" made by his department.

He said: "We didn't undertake a thorough enough assessment.

"We were too narrow in our focus. Bertram Byfield was honest about his convictions and prison sentence, but there was a whole element to his life we did not assess properly."

Toni-Ann's mother Roselyn Richards will be seeking a public inquiry

Mr Hay said the team manager and social worker involved in Toni-Ann's case were no longer in their jobs.

"Toni-Ann was a child in care and we let her down," he said.

The summary report, made public at a news conference in Birmingham on Thursday, said there were delays in producing assessments and reports and in establishing Toni-Ann's immigration status, which affected the quality of decision making.

The review - carried out by David Lambert, a former assistant chief inspector at the Social Services Inspectorate - concluded that the failings highlighted "the need for professionals to maintain a thoroughly watchful and diligent stance in respect of their safeguarding obligations to the children and young people in their charge".

DNA testing in post-mortem examinations revealed that Mr Byfield was not the biological father of Toni-Ann.

Toni-Ann's mother Roselyn Richards, 32, blames social services officials for not doing their job properly.

I want to know why Toni-Ann was with Bertram Byfield, and who was responsible? I cannot rest until I have these answers Roselyn Richards, Toni-Ann's mother

Ms Richards, who is from Jamaica, said: "Birmingham social services should have known where she was and taken appropriate action to ensure she was safe."

Her solicitor Shazia Khan said that Ms Richards will be asking the Health Secretary John Reid to order a public inquiry into the care arrangements for Toni-Ann.

The report by The Birmingham Area Child Protection Committee (ACPC) said social services failed to check the suitability of Toni-Ann's carer, carry out a risk assessment and inform their counterparts in London that a vulnerable child was moving to their area.

It blames the social worker and legal guardian appointed to look after Toni-Ann - who had been in the UK for four years - for placing her with a woman who was thought to be her aunt, but turned out to be one of Byfield's girlfriends.

In a statement Birmingham's child protection group has said lessons had to be learned by agencies involved with the child's care, and that action needs to be taken to better safeguard children.

Byfield, known as Anthony Pinnock in Jamaica, had previously served a nine-year prison sentence and survived an attempted shooting in 2002.

Scotland Yard believe he was affiliated to a Jamaican drug cartel and may have been killed over a drug debt he had previously tried to collect.