A chilling postcard detailing a sickening crime is up for auction next week for up to £1000 - because experts say it was written by 'Jack the Ripper.'<br /><br />Historical experts have validated the postcard, which was once used as police evidence in 1888 in an attempt to capture the brutal slayer.<br /><br />Written on the card is: “Beware there is two women I want here they are bastards, and I mean to have them with my knife is still in good order it is a students knife and I hope you liked the half of kidney. I am Jack the Ripper.”
