Newspaper Svenska Dagbladet reports the prosecutor saying that the suspects' position means they have a certain responsibility for workers' safety. If found guilty, they could face up to six years in prison.
In October 2011, a 28-year-old inmate was caught on tape beating to death Karen Gebreab at Stockholm's Flemingsberg detention centre. She had been left alone with the prisoner, who was known to be violent. He was later given a life sentence.
Following the brutal attack, lax security routines were criticised.