Two young boys found dead with their mother were suffocated, police have confirmed.
Phillip Stevens, five, and two-year-old Izaak are believed to have been killed by mother Melanie, 36, before she hanged herself.
The bodies were found at their home in Trawsfynydd, Gwynedd, North Wales, at around 8pm on Sunday after concerned relatives alerted police.
A spokeswoman for North Wales Police said: "Post-mortem examinations revealed both boys had been suffocated.
"The boys' mother was also found dead at the premises and her death is not being treated as suspicious.
"Detectives continue to conduct inquiries at the location with a view to establishing the exact circumstances leading up to this tragic event."
Ms Stevens, a divorced mother of five, had lived at the house on Chapel Street for about two years having moved from the nearby town of Blaenau Ffestiniog.
Her three older children are thought to live with their father.
DCI John Hanson, who is leading the investigation, said: "We continue to gather evidence and the coroner is appraised. Family liaison officers continue to work closely with the family and contact has been established with victim support."
An inquest into the deaths is expected to be opened on Wednesday.