The violence from Israel on Hamas has intensified in the past eight days.
More than 52,000 Palestinians have been displaced by Israeli air strikes that have destroyed or badly damaged nearly 450 buildings in the Gaza Strip, the U.N. aid agency said on Tuesday.
In a separate statement on the conflict, rights group Amnesty International said Israel air strikes on residential buildings might amount to war crimes. Israel says it hits only legitimate military targets and that it does all it can to avoid civilian casualties.
About 47,000 of the displaced people have sought shelter in 58 U.N.-run schools in Gaza, Jens Laerke, a spokesman for the United Nations Office for the Coordination of Humanitarian Affairs (OCHA) in Geneva, told reporters.
Laerke said 132 buildings had been destroyed and 316 had been severely damaged, including six hospitals and nine primary healthcare centres as well a desalination plant, affecting access to drinking water for about 250,000 people.
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