Israeli military strikes have killed at least 45 Palestinians across the Gaza Strip, most of them in the north of the enclave, Reuters reports according to Palestinian health officials.

At least 43 of those killed were in northern Gaza, where Israeli troops have returned to root out Hamas fighters who it claims have regrouped there.

Twenty people were killed following an airstrike on houses in Jabalia, the largest of the Gaza Strip’s eight historic refugee camps, which has been the focus of an Israeli military offensive for more than three weeks, medics and the Palestinian official news agency Wafa said.

An Israeli airstrike on a school sheltering displaced Palestinian families in Shati camp in Gaza City, killed nine people and wounded 20 others, with many in critical condition, medics said.

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