Former Prime Minister Helen Clark says she's shocked by Israel bombing a densely populated refugee camp in north Gaza.

Israel has defended the strike, saying it successfully targeted a Hamas commander responsible for the October 7 attack on Israel.

Gaza's Health Ministry says the attack killed at least 50 Palestinians.

Clark is also a former head of the UN Development programme.

She says the past three weeks have been devastating.

"The main UN humanitarian agency in Gaza- 67 of their colleagues have been killed. They're among more than 8,500 dead."

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