AUTHORITIES say they may never determine who's responsible for canisters of a deadly chemical washing up on beaches in Queensland and NSW.
The Australian Maritime Safety Authority (AMSA) is investigating the source of more than 20 silver canisters of aluminium phosphide.
They've been washing up on beaches from north Queensland to northern NSW since February last year.
When the chemical comes into contact with air or moisture it generates a highly toxic and flammable gas, which can be fatal if inhaled.
Aluminium phosphide is often used to fumigate ships. It's unclear if the canisters may have been lost overboard accidentally or dumped.
"It may not be possible to ultimately confirm the original source of the canisters due to the apparently long time lapse between when they may have entered the water and when they have been found," AMSA said in a statement on Tuesday.
AMSA has already checked incident reports of cargo losses but has not come up with any leads.
It is currently working with drift modelling experts to determine if the canisters may have originated from recent ship groundings or accidents in the Pacific region.
AMSA is also working with the Australian Pesticides and Veterinary Medicines Authority to work out if the canisters originated in Australia.
More information will be provided by the end of the week, AMSA said.
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