There are two unfolding situations at construction sites at Kellyville and Carlingford after walls collapsed due to strong winds.
In Carlingford, just before 10am, a man has been crushed to death after a wall fall on him.
Emergency More to come services were called to Talinga Street following reports the wall, which was under construction, was blown over in the wind.
A 30-year-old man was trapped under the wall and died.
Police continue to make inquiries and will prepare a report for the information of the Coroner.
At around 9.40am emergency services were called to a work site in Kellyville.
A 20-year-old tradesman has been taking to hospital after being stuck under brick wall with head injuries.
SafeWork NSW have been notified and their investigators are attending the scene.
More to come.