17 January 2013 Last updated at 10:36 ET

Una Crown, 86, stabbed and set on fire in Wisbech killing

Una Crown, pictured with late husband Jack, lived alone in her bungalow

An 86-year-old woman who was found dead at her Cambridgeshire bungalow had been stabbed several times and set on fire, police have said.

Una Crown, who was last seen alive on Friday, was found at her home in Magazine Lane, Wisbech, on Sunday.

A post-mortem examination found Mrs Crown, a widow who lived alone, died of stab wounds to her neck and chest.

Police said she was set on fire in an "apparent attempt by her killer to hide her injuries and destroy evidence".

Her clothes had been set alight but the fire did not spread to the rest of the bungalow.

Det Ch Insp Jon Hutchinson said: "This was a horrific murder of a defenceless elderly woman in her own home.

"The fire damage meant it was difficult to initially establish the cause of Mrs Crown's death."

Police have narrowed down the time of the attack to Saturday night or Sunday morning, as Mrs Crown had spoken to a friend by telephone at about 17:00 GMT on Saturday.