Brazil’s interim President Michel Temer has called an emergency meeting of state security ministers after a gang rape of a teenage girl in Rio de Janeiro triggered wide condemnation.

He vowed to form a federal police unit to deal with violence against women.

The girl, 16, believes she was doped after going to her boyfriend’s house last Saturday and says she woke up in a different house, surrounded by 30 men.

Hundreds of protesters on Friday demanded an end to sexual violence.

The video of the attack was put on social media, shocking Brazil.

Police are hunting more than 30 male suspects. Arrest warrants have been issued, including one for the boyfriend.

“I condemn most forcefully the rape of the teenager in Rio de Janeiro,” Mr Temer said.

“It is absurd that in the 21st Century we should have to live with barbaric crimes such as this.”

He said the authorities were working “to find those responsible” for the attack.

Women paint their faces with female gender symbols for a protest against the gang rape of a 16-year-old girl in Rio de Janeiro, Brazil, Friday, 27 May 2016.Women expressing their solidarity with the rape victim during protests on Friday night
A woman shouts holding a banner that reads in Portuguese A banner in Portuguese reading: “We’re all bleeding”

Rio police chief Fernando Veloso told a news conference that investigators will review forensic evidence.

“If these images hadn’t been posted, maybe we wouldn’t be here right now,” he said, adding that many rapes go unreported.

The rape is said to have taken place in a poor community in western Rio over the weekend.

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 she had received 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.”