Police investigating a house fire in Harlow which killed six members of the same family have made a fresh appeal on the BBC's Crimewatch programme.
It featured an interview with Dr Abdul Shakoor, who lost his wife and five children in the blaze last year.
Dr Sabah Usmani and her children, Hira, 12, Sohaib, 11, Muneeb, nine, Rayyan, six, and three-year-old Maheen all died when the blaze ripped through their home last October.
The police have also released previously unseen pictures of the burnt-out remains of the house in Barn Mead.
The pictures show a living room gutted by flames with the walls blackened and stripped back to brick and burnt debris scattered across the floor.
It is thought the fire started after burglars targeted the house. A car was found burnt out nearby in what may be a linked incident.
Detectives are keen to trace a white man in his late teens to early 20s who was seen on a bicycle near the scene of the crime.
They also want to find the family's black Toshiba Satellite laptop computer which was taken in the burglary.
Essex Police have also set up a dedicated Facebook page