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Probe over 1D knife pic
Harry Styles of One Direction. Picture: Stephen Lovekin/Getty Images.

Police have launched an investigation after a One Direction fan terrorised Harry Styles' ex-girlfriend by sending her a photograph of a woman wielding a knife.

British TV presenter Caroline Flack hit headlines last year when she enjoyed a short-lived romance with the singer when he was 17 and she was 32.

Flack was subjected to a barrage of abuse on Twitter from envious fans of the boy band, and now she has called in police after she was sent a photo of a woman clutching a huge knife.

The account from which the picture was sent has since been deleted.

A pal of Flack's told British newspaper The Sun: "Caroline was shocked."