Detectives investigating the house fire in Harlow that killed a woman and all five of her children, are now treating the deaths as murder.
The blaze was started by burglars in the lounge, and the flames then spread throughout the house.
There is a £10,000 reward to help catch the killers.
Lauren Hall reports.
More top news
Incredible footage has been released by Surrey Police of a police chase which ends with the suspected stolen car knocking down an officer
It follows a winter that saw some animals killed by bird flu.
Satellite images show how the country has turned from green to brown after weeks without rain.