A 16-year-old sustained four wounds to his upper body following a stabbing in Creggan on Friday evening.
It’s thought the incident took place near shops in the Creggan Heights area when the teenager became involved in an altercation with another male.
He was taken to hospital after the incident but his condition is not thought to be life threatening.
SDLP Foyle assembly candidate Mark H Durkan has warned over the dangers of knife crime after the incident.
“The dangers of knife crime are so apparent yet there are those who continue to carry knives in our community,” he said.
He continued: “Thankfully, there has not been a death here and I wish the victim a speedy recovery but this was by good fortune that there has not been a fatality.
“We have seen tragic examples in the past of what knife crime can do not only to one person, but family and the wider community.
“Knife crime needs eradicated, those responsible need to be brought before the courts. Anybody with information needs to pass it to the PSNI.”
A 21 year old male has been arrested and is currently helping police with enquiries.
Anyone who witnessed the incident or who has any information is asked to contact police in Derry on 0845 600 8000. Or, if someone would prefer to provide information without giving their details, they can contact the independent charity Crimestoppers and speak to them anonymously on 0800 555 111.