A leading international human rights group has criticized Russian police for what the group calls a policy of beating and torturing of suspects.
London-based Amnesty International also says Russian authorities take insufficient action to probe reports of such incidents.
Amnesty says Russian non-governmental organizations documented more than 100 cases of abuse in 11 regions of the country last year. It says the abuse included beatings with clubs, fists and plastic bottles full of water.
Amnesty says authorities fail to inform prisoners' families of their detention. It also says authorities use convicts to torture other prisoners and prevent prisoners from receiving medical treatment from a doctor of their choice.
The group says the Prosecutor General's office has acknowledged a duty to investigate complaints, but it says the prosecutor's role as a crime investigator undermines its ability to respond to complaints of torture.
Some information for this report was provided by AFP and AP.