Two teenagers and a young man were rushed to hospital after being stabbed in Wealdstone.
Emergency services flooded High Street after being called to reports of a stabbing just after 7pm on Tuesday, November 30.
Police and paramedics found two boys, aged 14 and 16, with stab injuries, the Metropolitan Police said.
They were taken to a west London hospital where their injuries were assessed as non-life-threatening.
A short time later a third person, a 22-year-old man, was found with stab injuries outside Harrow and Wealdstone Underground Station.
He was taken to a west London hospital where he remains in a stable condition.
A Section 60 order, which provides officers with additional search powers to prevent further violence, had been authorised following the incident until 8am this morning.
Anyone who witnessed the incident is asked to call 101 with the reference 6046/30NOV. Information can also be provided to Crimestoppers, anonymously, on 0800 555 111.
- Two people, a 14-year-old boy and a 16-year-old boy, have been arrested on suspicion of grievous bodily harm. They remain in custody at a north London police station.
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