"There are significant leads in relation to that matter", he said, without providing details of the case.
Queensland Police are leading an investigation into the source of the needles, and the state's Premier Annastacia Palaszczuk has stumped up a reward of $100,000 for anyone with information that leads to the capture of the culprits.
"Sadly, there are those in the community who perhaps don't understand the harm they're doing".
A woman from Adelaide's southern suburbs also claims she found a contaminated strawberry inside a punnet purchased last week.
Queensland Strawberry Growers Association vice president Adrian Schultz said what had started as a single act of "commercial terrorism" had brought a multimillion-dollar industry to its knees.
Growers and police have suggested that some cases may be copycat incidents.
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"People need to slice their fruit prior to consumption and please contact police immediately if you find any contaminated fruit", South Australia Police said.
Investigators plan to do forensic testing on the needles and say they're particularly focused on how the fruits were transported.
South Australian Police say she was not hurt.
The Queensland Strawberry Growers Association suspects a disgruntled ex-employee may be responsible for placing sewing needles into strawberries sold in Woolworths.
Queensland chief health officer Dr Jeanette Young has advised consumers to take care when consuming the fruit.
Queensland Police Service, who have launched an investigation into the potentially hazardous findings, revealed that affected brands include "Berry Obsession" and "Berry Licious", according to an update on the agency's Facebook account.
Aldi and Coles supermarkets across the country have removed all strawberries from shelves as a precaution and New Zealand stores have also stopped supplying Australian grown strawberries to customers.