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Payments giant Mastercard is reviewing its business with pornography platform Pornhub, following allegations published by the New York Times.

Pornhub parent company MindGeek has denied Pulitzer Prize-winning journalist Nicholas Kristof's claims he found multiple videos featuring child sex abuse, "revenge porn" and rape.

Mastercard rival Visa is now also investigating, according to Sky News.

MindGeek said the claims were "irresponsible and flagrantly untrue".