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Investigations are under way after two young boys known to social services were stabbed to death.
Jael Mullings, 21, was arrested on suspicion of killing her sons, Romario Mullings-Sewell, two, and his three-month-old brother Delayno, on Thursday afternoon.
It emerged the family was known to social services but they no longer had a social worker to help them.
Police involvement is also being examined after it was revealed officers called at the house just hours before the brothers were killed.
The Independent Police Complaints Commission said it was launching an investigation hours after Manchester City Council announced that it was also reviewing social services' involvement in the tragedy.
Both boys, described as "gorgeous" and "beautiful", were stabbed in the stomach and found dead at the family home in Cheetham Hill in the city. Their mother has been sectioned under the Mental Health Act.
Greater Manchester Police were first alerted by a call from a local doctor's surgery with reports of concern for the welfare of Ms Mullings. Officers were dispatched to the house, arriving about 2.50pm, but there was no one at home and they could not get in.
A neighbour told them the mother had been seen pushing a double buggy with the children at shops nearby. Officers searched the area and visited the children's grandmother to try to find Ms Mullings, who was described as in a "distressed state".
It is understood Ms Mullings then went to her mother's house. Shortly after, paramedics received a call to go to Kilmington Drive where they found the children just before 6pm. Police were then called.
In a statement, the boys' devastated family paid tribute to the "beautiful, innocent children". The family said: "We hope that wherever the boys have gone to, they are at peace."
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