Detectives investigating the deaths of three children and their father at a beauty spot in Shropshire have recovered a knife.
The bodies of Sam Fuller, 12, and his younger sisters Becka, aged eight, and seven-year-old Charlie, were found in woodland on Monday, believed to have died from knife wounds.
The body of their father Ceri Fuller, 35, was found nearby at the Poles Coppice on Pontesbury Hill, near Shrewsbury, Shropshire. Fuller is thought to have fallen from a cliff.
Officers found the bodies of the Fuller children shortly before 10am on Tuesday. The family Land Rover Freelander was discovered nearby.
Police investigate the area near where the three children were found
West Mercia detectives have launched a murder investigation but described the deaths as a "tragic family situation" and are not looking for anyone else.
Mr Jamieson announced: "One line of enquiry being considered is that the father took the children's lives before taking his own."
Detective Chief Inspector Neil Jamieson, who is leading the investigation, said: "I can disclose that a weapon has been recovered from the scene.
"Officers involved in the search found a knife in the vicinity of where the bodies were found.
"It will now be forensically examined."
Jamieson also confirmed post-mortem examinations will take place on Tuesday, with results not expected before Wednesday.
The family's Land Rover was left near where children were found
Police are appealing for information about possible sightings of the vehicle and its four occupants on Thursday.
Mr Jamieson said: "We believe this vehicle left Gloucestershire at some point last Wednesday evening or early Thursday morning and we are anxious to establish its movements since then, especially in the Pontesbury area."
Becka and Charlie were pupils at St John's Church of England Primary School in Coleford, which older brother Sam had also attended before moving to secondary school.
Mr Fuller worked as a production superviser at the Lydney-based Glatfelter paper mill, having joined in 2002.
Mr Fuller married his wife Ruth in August 2009 and neighbours said they had lived in the village of Milkwall a year.
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