Days later, the Metropolitan police’s homicide unit took over the case after the Guardian independently tracked down passengers who said Mubenga had complained he was unable to breathe for several minutes before his collapse. The unit arrested three guards, aged 35, 48 and 49, and questioned them under caution.
Police have tried to trace other passengers for more in-depth interviews.
Four G4S whistleblowers last month submitted evidence to the Commons home affairs select committee. The evidence, obtained by the Guardian, alleged serious failings by G4S. It also contradicted some of what senior G4S officials told MPs at a hearing after Mubenga’s death.