Warning: this video contains footage that may be distressing to some viewers.

In October 2025, 122 people were killed in what would become Rio’s deadliest police operation. ‘Operation Containment’ was designed to arrest members of one of Brazil's most powerful organised crime groups, the Red Command.

Three months after the police raid many questions still remain, but the Guardian's investigation found that at least one person killed was not a gang member. Police chiefs and conservative politicians have hailed it as a historic blow to organised crime but activists, security experts, the families of the dead, and even Brazil’s president, Luiz Inácio Lula da Silva, have called a disastrous and futile massacre.

A team of journalists across the Guardian has pieced together police body-camera footage, satellite imagery and pictures and video posted to social media to get the clearest picture to date of what happened that day.

• Rio’s bloodiest day: the untold story of Brazil’s most deadly police raid