LONDON, July 17  A year after the police shot and killed a Brazilian electrician in the subway after apparently mistaking him for a suicide bomber, prosecutors said Monday that they would not charge any individual officers in connection with his death.

But the senior reviewing officer for the Crown Prosecution Service, Stephen O’Doherty, said the death of the Brazilian, 27-year-old Jean Charles de Menezes, had been the “cumulative result” of police errors. As a result, prosecutors said, the office of the Metropolitan Police commissioner, Sir Ian Blair, would be charged with failing to protect the health and safety of Mr. Menezes.

“After the most careful consideration, I have concluded that there is insufficient evidence to provide a realistic prospect of conviction against any individual police officer,” Mr. O’Doherty said in a statement, explaining that the two officers who fired a total of seven shots at Mr. Menezes genuinely believed he was a terrorist.

To be acquitted of the health and safety charge, the police must establish that they did everything possible to protect Mr. Menezes’s safety. If convicted, they face a fine to which there is no limit set by law. In a statement, they said they were “concerned and clearly disappointed.”