A man was rushed to hospital with serious head injuries after he was assaulted outside Chalk Farm tube station in the early hours of this morning.
Witnesses described seeing a fight break out between a group of men, which resulted in one of them sustaining a serious head injury.
She said: "There was a big fight, police were there and they sealed off half the road."
A London Ambulance Service spokeswoman said: "We were called at 1.40am to reports of an assault in Haverstock Hill, near Chalk Farm underground station.
"The ambulance arrived in three minutes.
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"A man with head injuries was taken to hospital as a priority."
A Met Police spokesman said: Police were called by London Ambulance Service at 1.40am on Wednesday, June 1, to a man collapsed near to Chalk Farm tube station in Camden.
"The man was taken to hospital suffering head injuries. His condition is serious, we await a further update.
"Camden officers attended the scene and an investigation was launched. Enquiries continue to establish the full circumstances."