
Mladenov made the remarks in reaction to killing a 15-year-old Palestinian in Gaza Strip protests on Friday.
Killing children will give no aid but it will increase violence and manslaughter, he said.
He called for protecting children against violence and for probing into the tragic accident.
According to Palestine Health Ministry, four Palestinians were killed and 645 others were injured during the 4th week of March of Return protests in Gaza Strip.
Scores of Palestinians have so far been killed and over 3,000 others were injured in March of Return protests.
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