The men, aged in their 60s, remained in serious but stable condition after being transported to two separate hospitals, Ambulance NSW said on Monday. One of them sustained a leg injury and the other injured his neck, a spokesperson for the emergency service told AAP. Piles of large bricks were strewn on top of each other and the destroyed roof damaged vehicles parked nearby. One patient was transported to St Vincent's Hospital and the other to Royal Prince Alfred Hospital. Urban search-and-rescue firefighters are at the scene, with police clearing the area and evacuating workers from the construction site.