"We don't know what we are going to eat to break the fast," Zaki Abu Mansour, 63, said inside his tent. "I have only a tomato and a cucumber... and I have no money to buy anything."
Goods that are available are sold at exorbitant prices, residents say.
Fighting raged across Gaza, even as UN Secretary-General Antonio Guterres called for "silencing the guns" during the Muslim holy month and said he was "appalled and outraged that conflict is continuing".
Guterres also appealed for removal of "all obstacles" to aid delivery.
