Palestinian children are facing death and serious injuries from unexploded bombs scattered throughout the Gaza Strip, the UN humanitarian agency OCHA has said in its latest update, Al Jazeera reports.

In the most recent incident on June 29, a nine-year-old girl was reportedly killed, and three others injured, by an unexploded bomb south of Khan Younis, OCHA said. Eight other children have been injured in two other recent incidents involving unexploded bombs, OCHA added.

According to the UN Mine Action Service (UNMAS), at least 10 percent of ammunition potentially fails to function, meaning many of the hundreds of thousands of tonnes of ruin debris in Gaza contain explosives.