Brazilian police are hunting more than 30 men suspected of raping a teenage girl in Rio de Janeiro, and of putting video of the attack on social media.
The girl, 16, believes she was doped after going to her boyfriend's house on Saturday and says she woke up in a different house, surrounded by the men.
Arrest warrants have been issued, including one for the boyfriend.
The assault has provoked an online campaign against what campaigners call a culture of rape in Brazil.
Conflicting versions of the story are still coming in, but the rape is said to have taken place in a poor community in western Rio over the weekend.
According to a statement she is reported to have given to police, she woke up on Sunday, naked and wounded, and made her way home.
Only days later did she find out that some of the alleged rapists had put images of the attack on Twitter.
A 40-second-video was widely shared and followed by a wave of misogynistic comments, before the users' accounts were suspended.
In a message posted on Facebook, the victim said she was thankful for the support and added: "I really thought I was going to be badly judged."
She later said: "All of us can go through this one day. It does not hurt the uterus but the soul because there are cruel people not being punished!! Thanks for the support."
'We all cried'
The girl's grandmother told Brazilian media the family watched the video and cried.
"I regretted watching it. When we heard the story we didn't believe what was happening. It's a great affliction. It's a depressing situation," she told Folha de S.Paulo newspaper.