POlice confirmed that it is investigating the possibility that it could have been a targeted attack, saying it is not ruling out anything at this stage of the investigation.
The boy's mother, Reziye, visited the scene and said: "We are devastated. This violence must stop.
Islington Advisor Paul Convery said the area has been plagued by gang problems for years with four fatal stabbings at Islington in 2018.
"There is a long-lasting antagonism between Cally Boyz and EC1," he said.
"Violence in this area has taken place regularly and there has been growing concern that something more tragic may happen.
He said there were "unpleasant parallels" to the murder of Alan Cartwright in 2015, who was only 15 when he was stabbed while riding a bicycle on the Caledonian road. Nedim is the second teenager to be killed in the capital in 2019 after 14-year-old Jaden Moodie was knocked off a moped and stabbed to death by a group of men in Waltham Forest on January 8.
Police patrols in neighboring areas have been strengthened, and a stop and search order in Section 60, which allows police to search anyone in a specific area, has been authorized.