The head of the UN says he is "appalled" by reports of Palestinians killed and injured while seeking aid in Gaza on Sunday.
Secretary-general Antonio Guterres called for an independent investigation, and said: "It is unacceptable that Palestinians are risking their lives for food."
At least 31 people were killed near an aid distribution centre in the Rafah area of southern Gaza, according to the territory's Hamas-run health ministry.
Witnesses said the deaths came after Israeli forces opened fire at a roundabout near a hub for the Gaza Humanitarian Foundation (GHF), a controversial new aid organisation backed by Israel and the US.
However, Palestinian and Hamas-linked media have attributed the deaths it has reported on to an Israeli airstrike.
The Israel Defence Forces (IDF) said "false reports have been spread".
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