A toddler has been stabbed to death in a flat in east London.
The girl, believed to be aged two, was pronounced dead at the scene
Police officers were called to Law House in Maybury Road, Barking, at 0015 BST, where they found the dead girl, believed to be aged two.
A woman in her 20s, thought to be the mother, was also found at the flat with stab wounds and was taken to hospital where she is in a serious condition.
The Met's Child Abuse Team said they were not looking for anyone else in connection with the girl's death.
Five days ago the woman was assessed by the local mental health trust after concerns were raised by neighbours but she was deemed fit to look after the child.
Police confirmed that a woman in her 20s was arrested on suspicion of harassment in the local area on 8 August.
A spokeswoman said they had been called to deal with the same woman on Saturday, but she was not arrested.
A spokeswoman for Barking and Dagenham Council said: "The mother was brought to our attention on August 8.
"On August 9 mental health assessments were carried out by North East London Mental Healthcare Trust. She was found not to have any mental healthcare issues."
The spokeswoman said the woman had lived in the borough since last year.
In a statement North East London Mental Health Trust said: "As is standard practice in an incident involving the death of a child, the case will be the subject of a multi-agency serious case review."
"North East London Mental Health Trust will also be conducting its own internal investigation."
Neighbour Hannah Nolan, 11, and her cousin left a bunch a flowers and a teddy bear by the police cordon.
The tribute read: "To a little angel, who was sent to bud on earth and bloom in heaven. God bless you, from your neighbour."
Hannah's mother, Janet Murphy, said she knew the woman by sight and heard about the death from a shopkeeper.
A post-mortem examination was due to be carried out on Wednesday.