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Footage shows a man slicing an unsuspecting woman across the bottom - before casually strolling off.
CCTV released by police show the man step up behind the victim, a woman in her 20s, as she searches for something in her bag.
The suspect, who struck in Westminster, London at nighttime first appears behind the woman.
Police say he slashes her across the bottom with a sharp object.
She spins around and grabs the point of contact, by which time the suspect has fled the scene.