IOWA CITY, Iowa (AP) — Authorities say inmates used hammers to attack prison staff members during a failed attempt to escape an Iowa prison, killing a nurse and correctional officer and severely injuring an inmate who intervened. The victims of the attack at the Anamosa State Penitentiary were identified as staff nurse Lorena Schulte, 50, of Cedar Rapids, and officer Robert McFarland, 46, of Ely.

Both had worked at the prison in the city of Anamosa in eastern Iowa for more than a decade. An investigator says each died of blunt force trauma to the back of the head when they were attacked with hammers during Tuesday’s attack. Inmates Michael Dutcher, 28, and Thomas Woodard, 39, face murder and kidnapping charges.