The allegation the Brazilian police are currently investigating, Reuters reported
The reported assault was discovered after one of the suspects posted to Twitter a video of the nude, semi-conscious youth, with a few men brazenly insulting the girl, showing their faces, and one man heard saying, "more than 30 impregnated her!" The Twitter account where the video was posted has since been suspended.
Police said the girl told them more than 30 men had assaulted her, but they could not yet confirm how many took part in the alleged rape, as they are still investigating, Reuters says
"There are all the indications that this rape did in fact happen, but we still have to investigate further before we can absolutely confirm it," said Fernando Veloso, head of Rio's civil police department, at a press conference on Friday.
Veloso said police have identified four suspects so far in the assault that apparently took place last Saturday in a western Rio slum - but have yet to make any arrests, saying further investigation is required.
Hashtags on Twitter such as #EstuproNaoÉCulpaDaVitima - Portuguese for "rape is not the victim's fault" - blasting the reported crime were among the top global trends.
Many Facebook users in Brazil, including suspended President Dilma Rousseff, the nation's first woman leader, changed their profile photos to the Venus female gender symbol with words calling for an end to a "culture of rape."
Brazil's interim President Michel Temer wrote on his Twitter account that he "vehemently repudiates" the alleged rape, and added that "it is absurd that in the 21st century we have to live with barbaric crimes like this."
Temer appointed a new government this month when Rousseff was suspended to face trial in the Senate for allegedly breaking budget rules. He came under intense criticism for excluding women and black Brazilians from his cabinet - something not seen in decades.
Temer said his justice minister would meet on Tuesday with the public security chiefs who oversee policing in Brazilian states to discuss how better to combat violence against women.
The interim president also said he would form a special department within the federal police focused on crimes against women, which would help to coordinate action and share information among the individual state security departments.
When Temer served as head of public safety for Sao Paulo state the early 1990s, he created the first police division in Brazil devoted to combating crimes against women, an idea that has since spread throughout the country.