The City of Sherbrooke, Que. and its police force are offering a $5,000 reward for information in the dirty needle case that has clothing retailers and consumers on edge.
Several blood-tainted syringes have been found, needle up, in clothing items for sale in various retail stores over the last few months.
At least eight people have been accidentally pricked.
The most recent discoveries were on Sunday, when a store employee found three needles hidden in clothing pockets.
Since January, 23 dirty needles have been reported to authorities.
Police and city officials hope a monetary reward will yield new clues in their investigation.
Anyone with information is asked to contact Sherbrooke police at 1-819-821-5555.