Police are calling for witnesses after two women were beaten and robbed in a homophobic attack on a London bus.

One of the victims, Melania Geymonat, posted a photo on Facebook of herself and her girlfriend, Chris, covered in blood, along with a detailed account of the assault in English and Spanish.

The incident happened in the early hours of on May 30 on a night bus in Camden, north London.

"We have to endure verbal harassment AND CHAUVINIST, MISOGYNISTIC AND HOMOPHOBIC VIOLENCE because when you stand up for yourself s**t like this happens."

CNN has contacted Geymonat for comment.

London's mayor, Sadiq Khan, condemned the incident on Twitter, saying it was a "disgusting, misogynistic attack."

"Hate crimes against the LGBT+ community will not be tolerated in London," he added.