The U.N. on Friday more than doubled its aid appeal for Lebanon as the country reels from Israel’s war against Iran-backed Hezbollah, saying nearly $640 million was needed over six months.

“The humanitarian crisis in Lebanon is severe and deteriorating,” the U.N. humanitarian agency OCHA (Office for the Coordination of Humanitarian Affairs) said in a revised appeal for the country.

“Repeated displacements, insufficient shelter capacity and limited prospects for safe return are deepening vulnerability,” it said, warning that “affected people are rapidly exhausting their coping capacities, and essential services are under increasing strain.”

The U.N. had appealed for $308 million in March to support a massive emergency response led by Lebanon’s government through to the end of May. On Friday, it said another $331 million would be needed through the end of August.

Only $185 million had so far been received out of the initial appeal, OCHA said, adding that that amount had helped provide assistance to around 680,000 people between March 2 and May 31.

The aim now, it said, is to more than double that number to reach all of the 1.4 million people in Lebanon — around a quarter of the population — estimated to need humanitarian assistance in the country.

Lebanon says Israeli attacks have killed more than 3,500 people since Hezbollah drew Lebanon into the wider Middle East war on March 2, firing rockets at Israel in retaliation for U.S.-Israeli strikes that killed Iran’s supreme leader.

Nearly one million people have fled their homes while more than 1.2 million are facing acute food insecurity, Friday’s appeal showed.