Five Australia Post workers were rushed to hospital after a toxic pesticide leaked from a package at a post office.
The postal workers were exposed to the toxic substance at a facility on Morris Street in Townsville's West End, in Queensland, about 6.30am on Friday.
A suspicious substance was found to be leaking from a package which had also contaminated multiple other mail items nearby.
The worker who first discovered it quickly began to feel unwell and was later taken to hospital in a stable condition.
An immediate investigation was launched after police arrived at the scene.
A second emergency was then declared at a separate Charters Towers Australia Post sorting facility on Gill Street after four more workers fell ill about 6.40am.
The substance was later identified as a pesticide commonly used to kill termites.
Each impacted worker experienced mild symptoms after being exposed to the chemical but have since been discharged from hospital.
Australia Post said the incident should serve as a lesson for customers to properly package any potentially hazardous goods.
'The safety of our team members is our number one priority and Australia Post has strong, well established safety protocols around these incidents. We continue to support our team members,' a spokesperson told The Nightly.
'We remind all customers of the important safety regulations in place around the sending of dangerous, prohibited and restricted goods.'
No further contamination occurred at the facility.
Daily Mail Australia has contacted Australia Post for comment.