Chemicals were found in a filing cabinet discarded on Tennant Street in Fyshwick, the ACT Emergency Services Agency says.
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It said ACT Fire & Rescue was called to the incident at 1.30pm, sending the hazardous materials unit, breathing apparatus van, a pumper and a commander.
"Firefighters are conducting several tests to identify the substance," it said in a statement.
"There is no threat to surrounding businesses."