The Independent Police Complaints Commission (IPCC) has said it is investigating West Yorkshire Police's handling of concerns about the welfare of a four-year-old boy who starved to death.
Hamzah Khan's body was found at his home in Bradford in 2011, almost two years after he died in his cot.
His mother was jailed for 15 years in October last year after being found guilty of manslaughter.
The IPCC announced the investigation this morning, tweeting:
The Children's Minister Edward Timpson has criticised the report, claiming it did not explain why chances to protect Hamzah were missed.
Another source from the Department for Education described the report as "rubbish." Christine Talbot spoke to Professor Nick Frost, the man who oversaw the serious case review and asked him his response to those claims.
Justice Secretary Chris Grayling has told ITV News it is 'right and proper' for the Government to ensure tragic deaths like that of Hamzah Khan never happen again.
Earlier, children's minister Edward Timpson said a serious case review failed to address key questions.
He expressed his 'deep concerns' over the review's findings that the four year old's death could not have been predicted.
Mr Grayling supported his colleague's stand and said it was important no stone was left unturned in finding out what happened.
Calendar's Claire Ashforth has been to Bradford to find out how four year old Hamzah Khan was allowed to go unnoticed before and for two years after his death.
A woman who knew Amanda Hutton and her family has told ITV News that there was no way anyone could have realised that four year old Hamzah Khan had starved to death.
Hazel Dow spoke after today's controversial Serious Case Review into Hamzah's death.
She told Calendar:
"We had an inkling that maybe it wasn't great in that house. But I think nobody would have had a clue of how bad it was.
"Because there was a bit of a 'keep away' feel to the house we didn't want to intrude."
Today we heard from all the people involved whose work was examined in the serious case review into Hamzah Khan's death and it was a pretty heated press conference.
The professionals accept that systems failed. In fact rather movingly that chair of Bradford Safeguarding Children Board said that perhaps Hamzah could have been alive today if there had been more joined up thinking, if they had met together and shared information which is a pretty sobering thought.
But what they didn't accept was that there were any individual failings, no-one was negligent. It was simply that Hamzah fell through a system because no concerns reached the necessary threshold.
Well this has caused quite a row with the government who are of course asking for more answers as they say there were countless missed opportunities and that this once again raises concerns about the safety of some of our most vulnerable children.
The children's minister Edward Timpson has requested answers to ten key questions following the publication of a serious case review into Hamzah Khan's death.
Here are some of them:
- Whether or not one of Hamzah's siblings was assessed by social care workers after reporting domestic violence to the police in December 2006.
- Why no assessment was carried out in April 2009 after police reported to social care that Hamzah's mother Amanda Hutton appeared to be "under the influence".
- Why an assessment was not conducted in January 2011 when the school of one of Hamzah's siblings reported low attendance rates and that the child "appeared physically neglected".
Aftab Khan says today's serious case review will not get to the bottom of how his son, Hamzah, was allowed to go unnoticed by authorities and starved to death in his cot aged four.
Hamzah's mother, Amanda Hutton was found guilty of manslaughter by gross negligence and sentenced to 15 years in prison.