Syringes sent for forensic testing and days of surveillance video have revealed no information about the person or persons responsible for hiding a total of nine syringes in Walmart apparel.

Sheriff Clark Millsap said in a press release investigators again are turning to the public for help.

"Results from the GBI crime lab have been received from three syringes, and the results are negative," authorities said in the release. "These three syringes were submitted to be tested for fingerprint evidence and according to these results, no identifiable prints were able to be recovered."

While seven syringes, two of which pricked customers, were found hidden in the store's clothing during the weekend following Black Friday and shortly thereafter, two additional needles were discovered last week by customers.

"There has been no evidence uncovered from the video surveillance systems that can assist in investigation to this point," sheriff's officials added.

Meanwhile, Walmart spokesman Dianna Gee said the company is still committed "to getting to the bottom of this," but Gee did not address a question about additional measures the Cartersville store is taking to ensure the safety of its customers.

"Whoever is doing this is just plain wrong. They should seriously be ashamed of themselves," Gee said. "We're continuing to partner with law enforcement to catch whoever is responsible for this senseless act. We're confident our surveillance cameras will identify the person."

Neither of the two customers involved in syringe finds Thursday and Friday were pricked, but customers were injured when the first couple of needles were found in the store's clothing. Back on Dec. 5, investigators asked for the public's help after authorities reported the first seven hidden syringes found by customers and employees.

One of the two people pricked by the needles spoke out early in the investigation, referencing concern for her health.

Citing "no identifiers available to aid in the investigations," Millsap said detectives need a tip from anyone who may have helpful information.

Those with any clues as to the identity of the people responsible for hiding syringes in Walmart clothing are asked to contact the Bartow County Sheriff’s Office Criminal Investigations Division at 770-382-5050, extensions 6029 or 6030.

Anonymous reports are accepted via the Cartersville-Bartow County Crime Stoppers tip line at 770-606-TIPS (8477).

Millsap added Crime Stoppers would pay a cash reward to tipsters providing information that leads to an arrest in the case.