MughrabiUNITED NATIONS/CAIRO (Reuters) -The U.S.-backed group distributing aid in Gaza opened a third site on Thursday and said more would open in coming weeks as the arrival of thousands of Palestinians seeking desperately needed supplies has tested the capacity of the new system.

DEIR AL-BALAH, Gaza Strip (AP) — A crowd was fired upon while overrunning a new aid-distribution site in the Gaza Strip set up by an Israeli and U.S.-backed foundation, killing at least one Palestinian and wounding 48 others, Gaza’s Health Ministry said Wednesday.

U.N. trucks delivering food to Gaza were stopped and looted overnight, Gaza residents and merchants said on Wednesday.

The Israeli military is again advancing into Gaza and has blocked most aid, causing widespread hunger. A new but widely criticized system for getting relief in started operating this week.

A U.S.- and Israeli-backed private organization is overhauling the aid distribution system in Gaza. The United Nations says it undermines humanitarian principles.