Guterres said nine UNRWA staff had already been dismissed for alleged involvement in Hamas's attack on Israel on 7 October and any UN employee involved in acts of terror would be held accountable, including through prosecution.
He said the UN Office of Internal Oversight Services, the highest investigative body in the UN system, had already been asked to mount an inquiry.
Israel's foreign ministry has vowed that UNRWA will play no role in Gaza when the conflict ends. The agency has 13,000 staff in Gaza and educates 30,000 children.
Israel formally handed information to the UNRWA commissioner general, Philippe Lazzarini, last Sunday alleging that up to 12 UNRWA staff had been involved in the 7 October attack.
Lazzarani immediately flew to New York to discuss the allegations with Guterres before informing key donors in the middle of the week and making an announcement on Friday, just as the international court of justice (ICJ) was delivering its verdict on South Africa's request for a provisional order directing Israel to allow aid into Gaza.
UN officials had hoped to prevent a donor collapse by being seen to act swiftly. But the US responded by suspending its funding, and since then nine other countries have followed suit, including the UK and Germany.
The US was the agency's largest bilateral donor in 2022, contributing more than $340m (£265m).
Denne historien er fra January 29, 2024-utgaven av The Guardian.
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Denne historien er fra January 29, 2024-utgaven av The Guardian.
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Parry: Premier League would be 'sterile' without EFL
Rick Parry has accused the Premier League of undervaluing the football pyramid, arguing that without the \"variety and competition\" that come from relegation and promotion the game would become \"sterile\".
Official review: Coote faces FA investigation as Webb breaks silence on video
The Football Association has launched its own investigation into the behaviour of the referee David Coote after remarks he made about Jürgen Klopp in a video that surfaced online this week.
Match-by-match: Coote's Liverpool games as an official
Referee who has been caught on video in a foul-mouthed tirade against Jürgen Klopp officiated 21 Liverpool games. Andy Hunter takes a look at the decisions in each one
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Is it really a surprise that an official or someone similar should end up glassy-eyed and spitting toxins on a sofa?
Hall's audition adds intrigue to England's Nations League finale
In-form Newcastle defender can show Thomas Tuchel he can be the solution to perennial problem on the left
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The super-lightweight world champion Katie Taylor says her rematch against Amanda Serrano in Texas, as the main support act to Tyson v Paul, will be something special
Blindkilde Brown and Fujino help City avoid slip up
Manchester City maintained their 100% start in the Women's Champions League group stage as second-half goals from youngsters Laura Blindkilde Brown and Aoba Fujino were enough to beat a determined Hammarby side.
Players must cope with extra scrutiny, says Lewis
The England coach, Jon Lewis, said his players experienced a \"sharp learning curve\" about perception management in the fallout from their disastrous group-stage exit in last month's T20 World Cup.
No input from Jones in England's plan to upset Springboks
England will not be benefiting from the insider knowledge of their former Springbok assistant coach Felix Jones this weekend after it emerged that neither their players nor key staff members have been in contact with the Irishman, still supposedly employed remotely by the Rugby Football Union (RFU).