BAE Systems said that three employees were involved in the incident which happened at the company's site on the . The Health and Safety Executive is carrying out an investigation into the incident, BBC reported.
A spokeswoman for BAE Systems said the jib of the crane snapped while it was being lowered for routine operations. She confirmed the crane had passed its annual statutory inspection in March.
The incident involved a crane operator and two shipwrights, one of whom went to hospital as a precaution. The other two men were treated at the scene.