Police were called by London Ambulance Service (LAS) at around 00:40hrs on Saturday, 25 February to reports of a stabbing on Upper Street, N1.
Shortly after this police were alerted to a second stabbing victim also on Upper Street.
Officers attended along with LAS and London’s Air Ambulance.
A believed 28-year-old man was taken to hospital. His injuries are being treated as life-threatening.
A believed 17-year-old male youth was taken to a separate hospital. His injuries are being treated as non life-threatening.
There have been no arrests at this time and an investigation into the incidents is ongoing.
Any witnesses or anyone with any information can call police in Islington via 101 or by tweeting @MetCC
To give information anonymously contact Crimestoppers on 0800 555 111 or visit crimestoppers-uk.org.