STORY: Gazans gather at a charity soup kitchen in Khan Younis to receive Ramadan meals cooked by volunteers.

Saturday was the first day of Ramadan – two days later, after Israel stopped aid deliveries to Gaza, organizers said they’d had to change the menu from meat to lentils because of price increases.

Israel blocked the entry of aid trucks on Sunday as a standoff over Gaza’s truce escalated.

Humanitarian aid agencies warned Gaza’s limited stockpiles of food, medicine and shelter supplies may spoil.

Volunteers at the kitchen, which provides meals for 20,000 people, feared food shortages. Here’s organizer Abu Omar.

“The kitchen administration prepared a plan for the month of Ramadan, but the closure of the crossings has disrupted all the plans, because of the closure and the extremely high prices.”

Hamas-run authorities deployed in local markets to question and detain merchants who put up their prices, according to Hamas sources and witnesses.

Ayoub Maarouf and his family break their Ramadan fast on the rubble of their house in Jabalia, a sign of the desperate need Palestinians face after the 16-month-long war.

Philippe Lazzarini, head of U.N. Palestinian relief agency UNRWA, said Israel’s suspension of deliveries threatened lives, and that aid and basic services “must never be used as a weapon of war.”

More than 300 trucks were stopped from crossing the border from Egypt on Sunday, according to the International Federation of the Red Cross.

While the Norwegian Refugee Council warned agencies could end up halting shipments of aid altogether, because keeping aid trucks waiting in queues is costly.

Maarouf fears the return of the hunger they suffered in wartime.

“We saw our children die at our feet and in front of our eyes and we couldn’t do anything for them, because of the famine that we witnessed. We ate grass – we cooked grass and ate it with spoons.”

Israel, while announcing the aid suspension, said it will not allow a ceasefire without the release of all remaining hostages.

Hamas has denounced Israel’s move as “blackmail” and a “blatant coup against the agreement.”