31 January 2013 Last updated at 05:37 ET

Wisbech murder: Man, 58, arrested in Una Crown case

A £10,000 reward is being offered by charity Crimestoppers for information which leads to the conviction of Una Crown's killer

A man has been arrested on suspicion of murdering an 86-year-old woman found stabbed to death in her Cambridgeshire home.

Widow Una Crown was found in her Wisbech home on 13 January. She had been stabbed and her body was burned.

Cambridgeshire Police said a 58-year-old man has been arrested in Wisbech on suspicion of murder.

He is currently in custody at Thorpe Wood Police Station. Post-mortem tests revealed she died from stab wounds.

Police said they now believed there was an electrical fault with the hob on Mrs Crown's cooker, but could not confirm whether they believed that started the fire or whether an accelerant was used.

Three men were seen near her home on the Saturday night between about 23:30 and 23:45 GMT, the force said.

A £10,000 reward is being offered by charity Crimestoppers for information which leads to the conviction of her killer.

Mrs Crown ran Elm Post Office with her late husband Jack, known as Ron, after they got married in April 1948.