Emergency crews rushed to Ultimo, near Sydney's CBD, today after part of a building and retaining wall collapsed at a construction site, causing significant damage and injuring several people. The incident occurred late Monday morning and prompted a large-scale response from Fire and Rescue NSW, NSW Ambulance and NSW Police.

According to emergency authorities, the collapse caused concrete debris and structural material to fall onto nearby vehicles and the surrounding work area. Paramedics treated multiple people at the scene, with two workers sustaining serious injuries before being transported to hospital for further treatment. Several others were assessed for minor injuries.

Firefighters worked alongside specialist rescue teams to ensure no one remained trapped beneath the debris. Heavy rescue equipment and structural engineers were deployed to stabilise the damaged section of the building before emergency crews entered the affected area.

Authorities established exclusion zones around the site while engineers assessed the stability of the remaining structure. Nearby roads were temporarily closed, and traffic diversions were put in place to allow emergency vehicles unrestricted access. Motorists were advised to avoid the area while investigations continued.

Police have confirmed that investigations are underway to determine what caused the structural failure. Workplace safety investigators are also expected to examine the site to establish whether construction standards, engineering factors or other issues contributed to the collapse. At this stage, authorities have not confirmed the exact cause.

The incident drew a rapid response from nearby businesses and members of the public, with witnesses describing hearing a loud crash before emergency sirens arrived. Construction workers from neighbouring sites assisted emergency responders by helping to clear access routes and account for workers.

Building collapses of this nature are uncommon in central Sydney, and today's incident has prompted renewed attention on construction site safety and structural monitoring. Workplace safety remains a priority across New South Wales, particularly on major commercial building projects where large numbers of workers are present.

Emergency services remained at the scene throughout the afternoon to secure the area and ensure there was no further risk to the public. Structural engineers continue to inspect the damaged building before any recovery operations begin.

Authorities have asked members of the public to stay away from the exclusion zone while investigations continue. Further updates are expected once engineers complete their assessment and investigators release additional information about the cause of the collapse.