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The Afghan national who was arrested after a man was stabbed to death in Uxbridge on Monday arrived in the UK via a lorry in 2020 and was granted asylum and leave to remain in 2022, it is understood. Police and ambulance crews were called to Midhurst Gardens, northwest London at around 5pm on Monday where three victims were attacked. CCTV footage captured the moment police Tasered and arrested the Afghan, 22, after a triple stabbing which left a 49-year-old dog walker dead in Uxbridge. The dog walker was treated at the scene but died, while a 45-year-old man suffered life-changing injuries. The third victim, a 14-year-old boy, sustained injuries which were not life-threatening or changing. The Afghan was arrested at the scene on suspicion of murder and attempted murder, Metropolitan Police said today. According to residents, a fight had broken out involving the Afghan national, who was living as a lodger in the home of the 45-year-old and who has not been named. The Afghan chased two victims out the house, eyewitnesses said, before the 49-year-old man - who was walking his dog at the time - tried to intervene and was slashed across the neck. Footage posted online today appears to show the suspect walking along a residential street, before two police officers sprint after him, one pointing a Taser and shouting 'drop the knife' and 'get on the floor'. Several others join them before the Taser is fired and the man falls to the ground. The attack is not being treated as terrorism, and detectives are working to establish any relationship between the suspect and the three victims, the Metropolitan Police said. There has been widespread shock within the local community following the brutal attack. One witness told the Daily Mail: 'The Afghan man was chasing a man and a boy around the road and a local man who was with his dog tried to stop it. 'There was blood everywhere and the paramedics were there for at least 30 minutes trying to save his life. It was absolute carnage and very distressing to see.' Another local added: 'The dead man is very well known around here. He's a lovely guy, very gentle and peaceful. He was just trying to help and it's ended up costing him his life.' A third witness said: 'I saw a young man come running out of the house waving a large knife around. He had a mad look in his eyes and was screaming.' Robin Stevens, 50, who lives on the other side of Midhurst Gardens, said he heard a lot of sirens at about 5pm on Monday. He said: 'We didn't really see anything apart from we heard a lot of sirens and were wondering where they were coming from. I left home at about 5.30pm, jumped in the car and as I've driven down it was all cordoned off. 'The tent was there. I must've counted about six squad cars that side, six or seven this side as well. It was quite shocking. 'It's a bit worrying really. I finished work at 10pm came back home about 10.30pm and I was talking to a couple of the coppers, all they could tell us was there had been a violent incident.' He said he found out what happened on Tuesday morning and was 'shocked', adding: 'I grew up on this street, I've lived on this street for 50 years and I've always known it to be quite a family orientated area.' Wisam Salah, 18, said 'everyone is really panicked' after the incident in Uxbridge. Mr Salah, who lives near the cordon, said: 'Yesterday I was out, I came home about 7pm. 'When I came home I saw multiple police cars, I think more than five. I was extremely confused.' He said he was 'extremely shocked' when he found out what had happened. 'Everyone is really panicked,' he added. One local claimed the Afghan had been living as a lodger for the past six months in the 45-year-old man's house. A police tent could be seen at one end of the road with forensics working on the street earlier this afternoon. Forensic officers were spotted walking down Midhurst Gardens towards the police cordon in a line. The 13 officers walked slowly and checked hedges on the sides of the road. Four bunches of flowers were placed near the police cordon, while another was left by a local woman from a neighbouring road. One woman who came to lay flowers near the police cordon on Midhurst Gardens said the incident made her feel 'absolutely sick'. The woman, who wished to remain anonymous, said: 'Last night the police came down my road, it was about 5pm, I thought to myself ''oh my god I wonder what's happened''. 'I just thought I'd come down and put some flowers down for the family.' Chief Superintendent Jill Horsfall said: 'This was a shocking and senseless act of violence that has left one man dead and two others injured. 'Our thoughts are with the victim's family and friends at this unimaginably difficult time. 'The incident will have understandably caused concern to the local community. I have deployed multiple officers to the local area, they will be here throughout the week to provide reassurance while detectives work intensely to piece together the circumstances. 'I understand that there has been a lot of speculation online following on from this incident. We ask that you rely on us for information, and that you do not share sensitive footage. 'If anyone saw or has any information about the incident, then please come forward to police. We appreciate any information that you may have. 'There will be a crime scene and a heavy police presence within the area over the next few days, I thank residents for their patience.' Anyone with information can call police on 101 quoting the reference 5129/27OCT, or to remain anonymous contact Crimestoppers on 0800 555111 or online.