BUENOS AIRES — Thousands of protesters took to the streets of Buenos Aires yesterday to demand justice for three young women whose torture and murders were live-streamed on social media, in a case that has shocked Argentina.

The victims’ relatives held a banner with their names—“Lara, Brenda, Morena”—and placards with their images, flanked by supporters as they marched to Parliament.

“It was a narco-feminicide!” “Our lives are not disposable!” read signs and banners as protesters banged on drums at the march, organized by a feminist group.

The bodies of Morena Verdi and Brenda del Castillo, cousins aged 20, and 15-year-old Lara Gutierrez were found buried Wednesday in the yard of a house in a southern suburb of Buenos Aires, five days after they went missing.

The crime, which investigators tied to drug gangs, was perpetrated live on Instagram and watched by 45 members of a private account, officials said.

Bloodthirsty

“Women must be protected more than ever,” Brenda’s father, Leonel del Castillo, told reporters at the protest. He had earlier said he had not been able to identify his daughter’s body due to the abuse she had endured.

Antonio del Castillo, grandfather of the slain 20-year-old cousins, was in tears, calling the killers “bloodthirsty.”

“You wouldn’t do what they did to them to an animal,” he said.

“I have hope that the truth will be revealed,” he added. “I ask people to stand with us.”

On Friday, National Security Minister Patricia Bullrich announced the arrest of a fifth suspect, bringing the total to three men and two women.

The fifth suspect, accused of providing logistical support with a car, was arrested in the Bolivian border city of Villazon.

Authorities have released a photograph of the plot’s alleged mastermind, a 20-year-old Peruvian, who remains at large.