Israel should “stop and think” before taking any further action in Rafah, Foreign Secretary Lord Cameron has said.
The former prime minister said the UK was “very concerned” about the situation on the Gaza-Egypt border.
Local health officials have said 37 people were killed in strikes on the city.
The foreign secretary said it was “impossible to see how you can fight a war amongst these people”, referring to the civilians in Gaza.
“There’s nowhere for them to go,” he added, with the border crossing to Egypt shut.
“We want Israel to stop and think very seriously before it takes any further action.
“Above all, what we want is an immediate pause in the fighting – we want that pause to lead to a ceasefire, a sustainable ceasefire without a return to further fighting.”
The Israeli military said it had conducted a “series of strikes” in southern Gaza on Monday.
It said the strikes had now concluded, without elaborating on the targets or assessing the potential damage or casualties.
Israel says it has expanded its ground operation in southern Gaza to root out Hamas fighters.
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