Medics said the Palestinian, who was not identified, suffered "more than 10" gunshots to the head and upper body after soldiers east of the Al-Masdar area opened fire.
Gaza health ministry official Adham Abu Salmiya told Ma’an that an ambulance crew transferred the teenager's body to the Al-Aqsa Martyrs Hospital in central Gaza.
An Israeli military spokeswoman told Ma'an that "IDF forces opened fire at a suspect approaching the security fence. The forces identified a hit," the official said.
The teenager had approached the border east of the refugee camp of Maghazi in central Gaza, Agence France-Presse quoted Palestinian witnesses as saying.
Earlier, Abu Salmiya said Israeli airstrikes killed one man and injured seven others in the central and southern Gaza Strip, in what the army called retaliation for a rocket attack hours before.
