A man has died after being involved in a worksite accident in Sydney’s west.

Emergency services were called to Forrest Road in St Marys at about 5.40am on Wednesday, a NSW Police spokesperson told Yahoo News Australia.

NSW Ambulance deployed a medical specialist team to treat the 30-year-old man who had suffered serious head injuries after becoming trapped in machinery.

Despite immediate treatment, the man died on site.

A Safework NSW spokesperson told Yahoo News Australia the worker sustained crushing injuries.

Police and Safework NSW are investigating.

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