Curry claimed to referee Ben O'Keeffe in the second quarter of the Stade de France clash that he had been called a 'white c***' by Mbonambi.
"World Rugby takes all allegations of discriminatory behaviour extremely seriously," a statement read.
"We can confirm that we are formally reviewing the allegation made by England's Tom Curry in relation to the use of discriminatory language during the England versus South Africa Rugby World Cup 2023 semifinal on Saturday.
"World Rugby will not be making further comment until the conclusion of the process."
England who had until Monday morning to lodge an official complaint with the citing officer - have declined to make any comment on the incident but South Africa began their own investigation on Sunday.
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Denne historien er fra October 24, 2023-utgaven av The Herald.
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Ford doubt for England's autumn Tests
RUGBY UNION England fly-half George Ford suffered a torn thigh muscle during Sale's 45-26 Gallagher Premiership defeat to Saracens.
Argyle acquit themselves well but pay the penalty in narrow loss to Burnley
WAYNE Rooney described as 'a little bit harsh' the penalty from which Burnley scored the goal to beat his Plymouth Argyle side 1-0 at Turf Moor.
Victorious Kellond keen to pursue Boxing career
PLYMOUTH teenager Mackenzie Kellond took the Western Counties Boxing Championship last weekend after he gave his opponent a standing eight count with just seconds to spare in Cheltenham.
Jones facing a pitch battle at World Cup
AMY Jones admits the conditions at the Women's T20 World Cup will challenge her as a wicketkeeper.
Sir Keir 'wants to make Brexit work'
SIR Keir Starmer promised a \"pragmatic, sensible\" approach to the UK-EU relationship in order to \"make Brexit work\", as he held talks in Brussels yesterday.
Taxi driver in fear after attack
PASSENGERS ALLEDGEDLY ASSAULTED DRIVER AND STOLE CASH
Crane needed as lorry gets stuck in lane
LORRY WAS THERE FOR THREE DAYS
Car park spots blocked over erosion worry
A POPULAR beauty spot near Plymouth has lost a number of parking spaces after concerns were raised about erosion.
Plastic fantastic in school contest
CONTEST COULD NET SCHOOL A BRAND NEW PLAYGROUND
AI cameras set to detect A386 traffic offences
SEATBELT AND MOBILE PHONE USERS BEWARE