Who is responsible for this accident?

Ramona McKenzie was on her way to work on a cloudy Monday morning when she got the call on her cellphone that no human resources manager wants to receive: An employee had just been injured at her workplace.
While turning into the company driveway, Ramona sees an ambulance, the injured worker, and a number of other employees surrounding the injured worker.
Ramona parks her car, rushes over to where the employee is lying, and inquires about what happened.