A coroner has said that he is satisfied a council has done everything it could have done since the deaths of a mother and her three children to prevent further tragedies.

Inquests into the deaths of Fiona Anderson and her children – Levina, three; Addy, two; and 11-month-old Kyden – concluded that Miss Anderson took her own life and that the three children were unlawfully killed.

Miss Anderson, 23, who was eight months pregnant, died on April 15 last year after falling from a multi-storey car park in Lowestoft. Within hours of her death, police discovered the young children's bodies at the family's flat in London Road South.

Miss Anderson, who feared her children would be taken into care, said 'I love you' to each of the youngsters before drowning them in the bath, kissing them, tucking them up together in bed and later taking her own life.

The Bury St Edmunds inquest, which concluded on Thursday – contrary to earlier reports that they would continue yesterday – heard that a Suffolk Local Safeguarding Children Board serious case review found that the repeated refusal by Miss Anderson and the children's father, Craig McClelland, to co-operate with social workers had made it difficult to take any effective action.

The review said attempts to intervene had been allowed to 'drift', a student social worker had 'inappropriately' been assigned to the case and the relationship between the couple and social workers had become 'adversarial'.

Although there were concerns over neglect, neither parent had been known to harm the children.

The family had been known to care agencies since she first became pregnant in 2009, the inquest was told.

Suffolk coroner Peter Dean said he was satisfied Suffolk County Council had done everything it could since the deaths to improve procedures.

He recorded a verdict that Miss Anderson took her own life and that the three children were unlawfully killed.