Israel has launched fresh airstrikes on Gaza as it prepares to seize the city after branding a declaration of a famine an 'outright lie'.

At least 25 Palestinians have been killed in Israeli strikes and shootings in Gaza, with over half of the victims sheltering in tents when they died while others were seeking food from aid providers, officials have said.

It comes after a United Nations-backed report declared famine in Gaza City on Friday.

The Integrated Food Security Phase Classification Report said starvation in the Strip 'is present and rapidly spreading'.

It also warned that the situation was 'entirely man-made' and that in the absence of a ceasefire to allow in aid, 'avoidable deaths will increase exponentially'.