A man was stabbed in Islington on Thursday (February 4) and his condition has been described by police as life-threatening.
Officers said they were called at 3.30pm to Battishill Street, near Upper Street, to reports of a stabbing.
A man, believed to be in his 20s, was found to have been knifed.
The Met initially said the man's condition did not appear to be life-threatening, but this has since been revised.
Islington Stabbing
Officers have closed Upper Street while the investigation is ongoing.
No one has yet been arrested.
Anyone with information is asked to contact the police on 101 with the reference CAD 4478/4 Feb.
Alternatively, contact Crimestoppers anonymously on 0800 555 111.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here