15 year-old Arkan Thaer Mizher was said to have been shot in the chest
It was not immediately clear what triggered the clashes, which have become common in several places in the Gaza Strip in the past few years.
Before this year's Gaza flotilla left Gothenburg, a solidarity ceremony was held in the Swedish city with the participation of hundreds of left-wing activists from Scandinavia and Europe.
The IDF stated that over 10,000 Palestinians were participating in Friday's protests.
There are multiple players influencing life in Gaza, but the humanitarian situation there is largely the result of Israel’s restrictive access policy.
"If we are helping Hamas, do you think the Israelis (would) allow us to go inside and come out?"
To prevent humanitarian crisis, Hamas should be left with policing capabilities, because the most important single cause preventing humanitarian crisis is law and order.
Egyptian naval forces have previously opened fire on Gazans they accused of crossing the maritime border.