Officers were called to Fraser Road in Edmonton just before 6pm, where they found the victims – all in their 20s – with stab wounds.
Two vehicles that had been involved in a collision were also found and a crime scene has been put in place, with the residential street closed off.
No arrests have been made.
It comes just 24 hours after a teenage boy was among three people hurt in a drive-by shooting just a few miles away from Fraser Road.
Scotland Yard is appealing for information regarding the incident in Gordon Road, Enfield, which saw two 22-year-old men and a 16-year-old boy fired at with a shotgun as they sat in the back of a taxi.
Police believe that two men approached the mini-cab after their vehicle pulled up alongside it, one of whom was armed with the weapon.
None of the injuries sustained in the shooting are life-threatening, although those suffered by one of the passengers are said by police to be potentially life-changing.
There have been no arrests in connection with the incident.
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