The Israeli army regularly arrests and shoots unarmed Palestinian fishermen, shepherds and farmers in the border areas if they near the moderation zone, as the authorities have not clarified the exact area assigned to that zone.
Israeli troops shot dead two Palestinian teenagers including a 14-year-old boy during Gaza border protests on Friday, Palestinian health officials said.
Hassan Shalabi, 14, "was killed by Israeli occupation live fire to the chest east of Khan Yunis" in the southern Gaza, the territory's health ministry said.
Friday's protests drew thousands of Palestinians who gathered at five locations along the fence, throwing rocks toward the Israeli forces stationed behind the frontier.
Palestinian protesters clash with Israeli troops on the Gaza-Israel border, east of Gaza City, on February 8, 2019.
Demonstrators demand the right of Palestinian refugees to return to their homes in historical Palestine from which they were driven in 1948 to make way for the new state of Israel.
The spokesman said soldiers used riot dispersal equipment and opened fired "in accordance with standard operating procedures". Earlier this week, Israel began reinforcing its fence, erecting a galvanized steel barrier six meters (20 feet) high that will run the length of Gaza's perimeter.
The marches of return and breaking the Israeli siege started on March 30 calling on Israel to end around 12 years of blockade that had been imposed on the Gaza Strip since 2007.
Since March 2018, 254 Palestinians in Gaza have been killed in clashes with Israeli troops, according to a report from the UN Office for the Coordination of Humanitarian Affairs (UNOCHA). The violence sometimes escalated into brief rounds of cross-border exchanges of rockets and airstrikes.