Women have been turned away from a screening at this year's Cannes Film Festival for not wearing heels.

Several women wearing flat shoes were forbidden from attending a showing of Todd Haynes' Carol on Sunday (May 17), ScreenDaily reports.

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Gisela Schober

The report provoked a backlash online and was also a topic of discussion at the Sicario press conference on Tuesday (May 19), as filmmaker Denis Villeneuve vowed to walk the red carpet in heels with stars Benicio del Toro and Josh Brolin in protest.

Director Asif Kapadia, whose Amy Winehouse documentary Amy was screened during the festival, tweeted about the regulations, revealing that his wife was initially turned away from the screening due to her choice of footwear.

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Others also confirmed that they were turned away from the red carpet during the event.

Cannes festival film director Thierry Fremaux has since denied suggestions that heeled shoes are obligatory for women at Cannes screenings, writing on Twitter: "La rumeur selon laquelle le Festival exige des talons hauts pour les femmes sur les marches est infondée... Pour les marches, le règlement n'a pas changé: 'Smoking, tenue de soirée'. Aucune mention sur les "talons'." ("Rumours that the festival insists on high heels for women on red carpets are unfounded... for red carpets, the dress code is unchanged. 'Black tie, evening dress.' There's no mention of heels.")

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Cannes gala screenings demand guests dress in black tie or evening dress, with "smart dress" requested for all other invitation-only screenings, according to the festival website.

The report comes after many Hollywood stars, including Patricia Arquette and Ethan Hawke, blasted Hollywood for gender inequality.

Steven Seagal's End of a Gun and Miles Teller's Bleed for This were amongst the films picked up at Cannes this year.