Yahya and his twin sister Nabila were playing in the ruins of their house in Gaza City when they came across a round object.

Their grandfather Tawfiq Shorbasi said they thought it was a toy.

When they reached for it, all it took was one touch and it went off.

Now the six-year-olds are lying in hospital beds, severely injured by what has been described as unexploded ordnance.

"Their lives have been ruined forever," Mr Shorbasi said.

Like many Palestinians, the twins' family seized the chance to return to what was left of their home after the ceasefire came into effect on October 10 .

People have been sifting through rubble searching for belongings, and for bodies unreachable until now.

But the dangers are far from over.

United Nations specialists estimate about 7,500 tonnes of une

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