The UN Mine Action Service (UNMAS) estimates that 37 million tons of debris litter the streets of Gaza, which will take more than a decade to clear up.

The debris includes up to 10,000 unexploded ammunition, according to Federico Dessi, Humanity and Inclusion’s Middle East director, told Al Jazeera. 

Dessi said the NGO works on the assumption that something between 50,000 and 100,000 bombs have been dropped on Gaza over the past six months.

“From 9 to 14 percent of these bombs did not go off – so potentially we are talking about up to 10,000 or a bit more of unexploded bombs, shells and mortars in Gaza,” Dessi said.