Update two - Man and woman collapse at Woden

ACT Fire & Rescue have now lifted the cordon at Woden Plaza.

An initial investigation by firefighters indicated a faulty boiler may have released carbon monoxide into the air conditioning system in the building opposite the plaza entrance.

The ACTF&R HAZMAT crew have completed ventilation of the building and atmospheric monitoring and declared the area safe.

ACT WorkCover will now investigate.