Iranian state media say officials admit that prison officers beat three people to death at a facility holding detainees arrested in post-election unrest earlier this year.
Iranian state television says prosecutors are charging three people directly involved in repeated beatings that led to the deaths (of Mohsen Ruhal Amini, Amir Javadifal, and Mohammed Kamrani). An investigation has so far resulted in criminal charges against at least 12 people involved in the violence at Tehran's Kahrizak prison.
The report said investigators found to be false earlier accounts indicating that meningitis killed the three prisoners.
Opposition groups say prisoners were abused, tortured and killed at Kahrizak, which housed many of those detained during protests against President Mahmoud Ahmadinejad's disputed re-election in June.
The prison has since been closed on the order of Iran's supreme leader Ayatollah Ali Khamenei, who said the facility was not up to required standards.