Four bodies, including those of two young girls, were found at a house in south-east England.
Police were called to Provost Street in the New Forest village of Fordingbridge at 11.20am.
There they discovered the body of a man, a woman and the girls, aged one and two, Hampshire Police said.
The doctor on the scene reported the woman and children had been stabbed and the man was found hanging, a spokesman for the ambulance service said.
The family were named locally as Andrew and Vicki Case and their daughters Phoebe, two, and Nereya, one.
The toddlers' grandmother, who usually looks after them on Mondays, went to the house after phoning the family repeatedly and receiving no answer, a neighbour said.
Neighbour Alayna Brooks (53) rushed over to the house herself after the grandmother found the bodies.
She told how the woman emerged screaming "all my babies are dead".
Ms Brooks said she went inside and found Mrs Case, in her 30s, dead in the dining room with a plastic bag over her head.
She then went upstairs and found the little girls dead on a bed. It is unclear where the man was found.
A cordon was set up around the £250,000 property, which lies in a pretty street of terraced and semi-detached houses, some with riverside views.
Mother-of-three Ms Brooks said the family had just returned from a week's holiday in Weymouth.
"They were so loved up," she said. "In fact if I had a marriage I would have loved their marriage — they just loved each other." She said she was "appalled" by what had happened and described the little girls as "gorgeous".
Acting Superintendent Gary Cooper, of Hampshire police, said: "The scene is still being examined as it is a very recent incident."
PA