Experts have warned of a looming famine in Gaza after an 11-week Israeli blockade that was recently eased.
A controversial new aid distribution group backed by the US and Israel has begun working in Gaza.
The Gaza Humanitarian Foundation said lorry loads of food had been delivered to secure sites on Monday and that distribution had started.
Hundreds of Palestinians collected food parcels from a site in the city of Rafa on Tuesday.
The foundation, which uses armed American security contractors, aimed to bypass the UN as the main supplier of aid to the 2.1 million people in Gaza, where experts have warned of a looming famine after an 11-week Israeli blockade that was recently eased.
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