The Gulf state is one of the largest donors to the impoverished Palestinian enclave and has funded the rebuilding of much of its infrastructure since a 2014 war with Israel.
Saudi Arabia and its allies cut off ties with Qatar on yesterday, accusing it of supporting extremism.
Riyadh, Cairo, Abu Dhabi and Manama have also closed their airspace to Qatari planes, a move which could severely damage the Gulf state's economy.
Jan Egeland, secretary general of the Norwegian Refugee Council and a former head of the UN's humanitarian wing, warned Qatar might have to cut back some of its aid to Gaza.
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After the 2014 war with Israel, gas-rich Qatar pledged USD 1 billion for reconstruction -- the largest of any single country.
As of December 2016, USD 216 million of that had been dispersed, according to the World Bank, with the Gulf state -- which is to host the 2022 FIFA World Cup -- suffering from falling energy prices.
Roads and other infrastructure in Gaza have been built with Qatari funding.
Qatar's rulers have strong ties to Hamas, the Palestinian Islamist movement that runs Gaza but which is considered a terrorist organisation by Israel, the United States and the European Union.
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