There are fears Monday's killing of seven World Central Kitchen aid workers, including three British veterans, has badly hit aid transportation into the besieged Strip.
Ex-Rifles sniper James Kirby, 47, and former Royal Marines John Chapman, 57, and James Henderson, 33, were blasted by Israeli missiles after they delivered 100 tons of aid.
Yesterday, Mr Kirby's cousin, Adam McGuire, said: "This should be a turning point now. Aid needs to flow to those areas.
"Not only James but the six other individuals, they're heroes.
"They went out there to help some of the most desperate people in the world. How this has happened is beyond any sort of recognition of how it could happen. I just hope that world leaders can get together and help these people.
"It is people at the end of the day, civilians, and that's what James was out there for and the other six people were trying to do."
Adam made his heartfelt plea as 13 leading aid organisations - including Save the Children, Oxfam and Amnesty International warned that "time is running out for Gaza".
Oxfam says 300,000 trapped northern Gazans are barely surviving on the equivalent of a can of beans a day.
One desperate mother there said: "Before the war, we were in good health and had strong bodies.
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