A man was taken to hospital in a critical condition after being assaulted.
Police were called at around 12.40pm on Friday with reports of the incident in Station Road and College Road, Harrow.
It is understood the man, 30s, was assaulted by another man at around 3.30am that morning before being taken to hospital by the London Ambulance Service.
He remains in a critical condition and his next of kin have been informed.
No arrests have been made and police enquiries continue.
Anyone with information is asked to contact police on 101 and quote CAD 3446/30Nov or call Crimestoppers anonymously on 0800 555 111.
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