Hamas says at least 55 people have been killed in overnight air raids in Gaza, according to the news agency AFP.
It said more than 30 homes were destroyed in the hours after an Israeli military spokesperson said airstrikes on the Gaza Strip would intensify as its troops prepare for an anticipated ground offensive.
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An Israeli military spokesperson, Daniel Hagari, said the attacks would help reduce risks for Israeli forces, who are massed around the border. He told Palestinian civilians in Gaza to keep moving south for their own safety, particularly those living in Gaza City.
Separately, Israel has carried out more deadly airstrikes in the occupied West Bank. The latest hit a mosque in Jenin, which the army described as a command centre for terrorists.