A data centre room in Civic was quarantined this afternoon after an unknown substance was reported.
ACT Fire & Rescue went to 51 Allara Street about 4.15pm, and HAZMAT crews assessed the situation using specialised equipment.
Firefighters isolated the occupants from the affected area as a precaution, and ACT Ambulance Service paramedics were on standby.
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The community was advised to avoid the area while the emergency services were on scene. WorkSafe ACT was notified and also attended the site.
But testing conducted by HAZMAT crews found the substance to be benign, and the scene was handed to Worksafe ACT.