The stories of two nurses who survived a gunman's attack on an intensive care unit in a York, Pennsylvania, hospital are being shared in Facebook posts that reveal new details.

A funeral service will be held later this week for a Pennsylvania police officer who was killed last weekend while responding to a gunman inside a hospital intensive care unit.

Investigators are trying to determine why a man targeted a Pennsylvania hospital, taking workers inside the intensive care unit hostage and holding one staff member at gunpoint as her hands were bound by zip ties.

Authorities say a gunman entered a Pennsylvania hospital’s intensive care unit and took staff members hostage before he was killed by police in a shootout that also left an officer dead.