A 67-year-old man is in a serious condition after being crushed by a 300kg crate of glass at a worksite in Sydney’s southwest.

Emergency services were alerted to reports of the incident at Roberts Road at 2.30pm on Wednesday.

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A NSW Ambulance spokesperson said the man suffered multiple injuries including serious head and shoulder injuries.

Emergency crews, including a specialist medical team, treated the patient at the scene.

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The man was taken to Liverpool Hospital in a serious condition.

It’s not yet known how the crate of glass fell.