He is due to appear at Parramatta Local Court on Tuesday morning.

Prosecutors will allege he made threats to staff members known to him via a telecommunications device.

A spokeswoman for the Western Sydney Local Health District confirmed police were called to an incident at Westmead Hospital “involving a member of the community” but said operations were not impacted.

Staff who spoke on the condition of anonymity, and were not at the hospital on the day, said Turner was the brother of one of their nursing colleagues who was recently stood down pending an investigation into an unrelated matter.

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A public search on the Australian Health Practitioner Regulation Agency reveals she has had multiple conditions placed on her nursing registration, including that she can only practice under the watch of a designated supervisor.

The nurses who received the death threats fear for their safety, their colleagues said.

NSW Nurses and Midwives’ Association general secretary Shaye Candish said the union was providing support to members after the incident.

“Violence against healthcare workers is never OK,” she said. “Nurses make up more than 85 per cent of workers affected by violent incidents in hospitals.

“Our members have a right to feel safe in their workplace. The government must do more to ensure occupational violence and aggression is stamped out in our hospitals.”

Health Minister Ryan Park’s office was informed of the incident on Friday.

“The safety and security of our health staff is paramount, and any threats to our staff are unacceptable,” Park said in a statement.

Westmead Hospital is one of the largest hospitals in NSW and treated more than 76,000 patients in its emergency department last year.