The UN agency also said more had to be done to tackle "abuse, neglect and violence against older persons".
Those who have fled are mainly from Bangui, as well as the cities of Bangassou, Rifai and Zemio in the south-eastern part of the country bordering DR Congo, the UN refugee agency said in a statement.
BBC: Central Africa Republic crisis: Refugee numbers 'swell'
In an interview with the BBC, the director of the UN aid agency Unrwa, John Ging, said the conditions in Gaza were "horrific".
The UN's relief agency Unrwa said it was "with great regret" that it had been forced to make a difficult decision temporarily to halt aid deliveries.
But on Monday, Iran's mission to the IAEA said if the UN agency "combined all related issues" then "once more, access would be granted".
Fatoumata Kaba, a spokeswoman for the UN refugee agency, the UNHCR, said 100 tents and food had been delivered to the area and would be distributed to refugees.
The UN Relief and Works Agency (Unrwa) said the centres would stay closed until it received security assurances for its property and staff.
The UN Relief and Works Agency (Unrwa) said in a statement that it had taken "the disappointing decision" after "discussions with the authorities in Gaza who have insisted that no women should participate".
The UN's refugee agency, the UNHCR, said there were now more than 670, 000 registered Syrian refugees and people awaiting registration in Jordan, Turkey, Lebanon, Iraq and Egypt.
The agency, UN's top nuclear inspector said, had found no recent indications that Iran had been seeking enrichment technology abroad and was now checking if Iran had sought to manufacture such technology domestically.
Mohamed El Baradei, head of the International Atomic Energy Agency, said Iraqi officials made the commitment during talks on Monday night with the UN inspection team.
"My dream is that a new agency like the International Telecommunications Union will be proposed at UN level to coordinate all this activity, " said Dr Claudio Portelli from the Italian space agency (Asi).
The ICRC is the only international humanitarian agency left in the Wanni, after the UN and others pulled out in September, when the government said it could not guarantee their safety.
The UN refugee agency's chief spokeswoman, Melissa Fleming, said it was the largest total raised at such a meeting.
While strict press rules prevent discussing exactly which companies said what in the Geneva meeting, the UN's telecom agency mentioned that the initial, partly publicized discussions saw a "heated debate" that mostly followed party lines.
The memo, from January last year, reportedly said the National Security Agency had begun a "surge" in eavesdropping on UN Security Council countries crucial to the vote on a second resolution for action in Iraq.
Iran had earlier said it was prepared under certain conditions to grant inspectors from the UN's International Atomic Energy Agency (IAEA) access to the key military site of Parchin.
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