A triple stabbing was reported on Monday, 7 July on Joel Street in Northwood Hills, prompting a large emergency service response.
A Tesco Express store was cordoned off by police, and a person was seen on the ground receiving treatment from officers. A second crime scene was also established on the same road.
London Ambulance Service confirmed that they were called at 1.01pm to reports of a stabbing on Joel Street. A spokesperson said: “We sent ambulance crews, paramedics in fast response cars and a clinical team manager to the scene. We treated two people. We took one patient to a major trauma centre and the other patient to a local hospital.”
Later, the Metropolitan Police confirmed that three men had been found with stab wounds at the scene.
A spokesperson for the Met Police said: “At 13:04hrs on Monday, 7 July officers and the London Ambulance Service responded to reports of a stabbing on Joel Street, Northwood Hills.
“Three men were found at the scene with stab wounds. They were treated by paramedics and then taken to hospital.
“One victim aged 19 has been discharged from hospital – his injuries were not deemed life-changing or life-threatening. He was arrested on suspicion of affray and remains in police custody.
“The other two victims remain in hospital. The injuries of one, aged 18, have not been deemed life-changing or life-threatening – we await an update on the condition of the second man, aged 17.
“They have also been arrested on suspicion of affray.
“Several lines of enquiry are ongoing.”
Anyone with information about the incident is urged to call police on 101 quoting CAD 3766/07JUL or to contact Crimestoppers anonymously on 0800 555 111.
Stay tuned to Harrow Online for the latest updates.

Chris Mitchell is the founder and editor of Harrow Online, Harrow’s leading local news platform.
He launched Harrow Online in 2010 as a Facebook page sharing local news and information. Since then, it has grown into a trusted source for breaking news, crime, council decisions, planning, transport, business and community stories across the borough.
Harrow Online reaches hundreds of thousands of readers each month and has a social media audience of more than 200,000 followers.
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