The men suffered 'significant injuries' in four separate knife attacks in west London, police say.
Police have released a CCTV image of a man they want to trace after four men were stabbed in the face, eye and ear in west London in recent days.
In the first incident, a 42-year-old man was attacked with a knife in Glencoe Road at 09:30 BST last Wednesday, 3 July, suffering an injury to his ear
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