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The knifeman who allegedly stabbed a policeman in the middle of Sydney's Central Station calmly walked up to him brandishing the weapon.
Constable Hayden Edwards, 30, was responding to an assault when he was allegedly attacked from behind about 6.45pm on Friday.
CCTV footage shows the alleged attacker sneak up behind Edwards holding the 30cm hunting knife and suddenly stab him in the back as he walked past.