The limited aid entering Gaza isn’t nearly enough, humanitarian groups say, warning that Israeli authorities' new rules have complicated distribution efforts.

The United Nations say aid groups have collected humanitarian aid carried by about 90 trucks, out of a total of nearly 200 that have entered Gaza since Israel began allowing limited goods in earlier this week.

A U.S.-backed organization aims to start work in the Gaza Strip by the end of May, overseeing a new model of aid distribution in the Palestinian enclave, but the United Nations says the plan is not impartial or neutral,