By Aidan Wondracz and Kelsey Wilkie For Daily Mail Australia
Published: 01:11 BST, 20 April 2019 | Updated: 01:15 BST, 20 April 2019
A police officer screamed for help after he was stabbed in the back in an unprovoked attack at a busy train station.
The 30-year-old officer had been responding to an assault when he was attacked from behind at Central Station, in Sydney, at around 6.45pm on Friday evening.
A witness said the victim staggered across the concourse before collapsing to the ground and lying in a pool of his own blood.
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A police officer screamed for help after he was stabbed in the back in an unprovoked attack at a busy Sydney train station
A witness said the 25-year-old officer crumpled to the ground after he was knifed at Central Station on Friday night
Jamie Jones saw the officer lying on the station