'Help, help, help!' Policeman, 30, who was stabbed in the back screamed while lying in a pool of his own blood at a busy train station as suspect is dragged away by officers A 25-year-old officer screamed for help after he was stabbed at Central Station Witness to the attack said officer fell to the ground before calling for assistance Officers were called to unrelated assault at Sydney station at 6.45pm on Friday The policeman was stabbed in the back and later underwent surgery at hospital By Aidan Wondracz and Kelsey Wilkie For Daily Mail Australia Published: 01:11 BST, 20 April 2019 | Updated: 01:15 BST, 20 April 2019 Viewcomments 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. Scroll down for video 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 floor. 'I wasn’t sure what was happening. I saw a guy laying face down on the tile area there and I saw a pretty decent amount of blood,' he told https://twitter.com/sunriseon7/status/1119348174571704320. Another witness described how the officer cried out for helpas other officers ran after the attacker. 'The copper was up against a pole, stood there for 10 minutes, then walked over. That’s where he fell and he’s telling people help, help help,' a witness told 9News. The injured policeman was taken to Royal Prince Alfred Hospital and underwent surgery. NSW Police told Daily Mail Australia the officer had improved overnight and was in a stable condition. Officers allegedly tasered a 53-year-old man before arresting him at the scene. Footage of the arrest shows a group of policemen drag the man out of the station. He was taken to St Vincent's Hospital under police guard for treatment. He remains in a stable condition and will undergo a mental health assessment. No charges have been brought against the man. Officers were called to an unrelated assault at Central Station at 6.45pm, before the knife attack happened Part of the station was taped off as police investigated the scene last night. Two years ago a man was killed at Central Station after threatening a 76-year old florist with a knife. He was shot dead after a confrontation with police. A police officer at the scene where a police officer was stabbed in the back at Central Station in Sydney, Friday Read more: Share or comment on this article: All rights reserved for this news site dailymail and under his responsibility