The father of three children found dead in their home says he is "paralysed with grief".
Eight-year-old twins Austin and Luke Riggi and their five-year-old sister Cecilia were found in an Edinburgh townhouse a week ago following reports of an explosion.
Their mother, Theresa Riggi, 46, who is being treated in hospital after apparently falling from a second-floor balcony, has been charged with their murder.
Engineer Pasquale Riggi, 46, spoke earlier of his last outing with his "happy, healthy, bright" children and how he celebrated what would have been Cecilia's sixth birthday on Monday.
Speaking from a hotel in Aberdeen, Mr Riggi said: "You are paralysed with grief. You are not sure what to do next. It is bad enough that you have lost three beautiful children, but certainly the tragedy around their deaths makes it much more painful."
Mr Riggi says he is having difficulty witnessing news reports: It's almost like it's happening to someone else and you keep asking yourself, 'is it me, is this my family?'. And then the reality hits you that it is.".
Shell employee Mr Riggi, who is from Colorado, and his wife, from California, came to live in the UK 13 years ago.
Mrs Riggi left the family's home in Aberdeenshire with the children at the beginning of July to move to the modern townhouse in Edinburgh.
Police and fire crews were called to a suspected gas explosion at Mrs Riggi's home on Slateford Road where they found the bodies of the three children.