A Sri Lankan mother suspected of stabbing two of her children to death was lonely and depressed by her life in Britain

Police have detained Sasikala Navaneethan, 35, under the Mental Health Act over the deaths of her son, 5, and his sister, 4. Their six-month-old sister remains in a critical condition after all three children were stabbed at their home in Carshalton, South London. Police have refused to give details of the incident but sources suggested that the throats of the older children had been cut.