A large fight in Station Road, Harrow outside Harrow on the Hill tube station was reported to the police by the London Ambulance service on Sunday, 9 July.
Officers attended and found four men - aged 23 (victim 1), 19 (victim 2), 20 (victim 3) and 21 (victim 4) - suffering from stab injuries.
All four were taken by ambulance to hospital, where Victim 1 remains in a critical condition and Victim 2 is in a serious but stable condition.
Victims 3 and 4 have been discharged from hospital.
Detectives from Harrow CID are investigating. Enquiries are taking place to establish the full circumstances of the incident.
There has been no arrest at this early stage.
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