JERUSALEM — Two weeks after the ceasefire between Hamas and Israel took effect, aid is flooding into the Gaza Strip, bringing relief to a territory suffering from hunger, mass displacement and devastation following 15 months of war.

But Palestinians and aid workers say it’s still an uphill battle to ensure the assistance reaches everyone. And looming large is the possibility that fighting will resume if the ceasefire breaks down after the six-week first phase.

As part of the ceasefire agreement, Israel said it would allow 600 aid trucks into Gaza each day, a major increase. Israel estimates that at least 4,200 trucks have entered each week since the ceasefire took hold.

Humanitarian groups say aid distribution is complicated by destroyed or damaged roads, Israeli inspections and the threat of unexploded bombs.

On Saturday, Samir Abu Holi, 68, watched over a food distribution point in Jabaliya, an area in northern Gaza razed to the ground during multiple Israeli offensives, the most recent of which cut off nearly all aid for over a month.

“I have more than 10 children. All of them need milk and food. Before the ceasefire, we used to provide food with difficulty,” he said. “Today there is a little relief.”

A surge of aid

The main U.N. food agency, the World Food Program, said it dispersed more food to Palestinians in Gaza during the first four days of the ceasefire than it did, on average, during any month of the war. Over 32,000 metric tons of aid have entered Gaza since the ceasefire, the agency said last week.

Aid is now entering through two crossings in the north and one in the south. Aid agencies said they are opening bakeries and handing out high-energy biscuits, and Hamas police have returned to the streets to help restore order.