Police fear the killer who fatally stabbed two sisters in a London park could strike again.Nicole Smallman, 27, and Bibaa Henry, 46, were attacked at Fryent Country Park in north-west London in the early hours of last Saturday.Police believe they were targeted by a stranger.Blood believed to be from the killer was found at the scene and police say they would have a "noticeable injury" and might possibly be wearing a bandage.But they have not been able to find a DNA match on the national database.Asked if the killer might strike again, Det Chief Insp Simon Harding said: “We always have a fear of what might happen but we are working around the clock.”The sisters had been celebrating Bibaa’s birthday with eight friends.They were left alone at.
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