The incident was determined to be isolated to this one store, police said.

YvanDube/iStock(ERIE COUNTY, Pa.) -- Bedbugs are believed to have been released inside a Pennsylvania Walmart, prompting a police investigation, authorities said.

The discovery was first made on Jan. 2, when an employee of the Walmart in Erie County found a closed pill bottle containing live bugs inside a boy's jacket that was on sale, Pennsylvania State Police said.

Walmart employees threw out the jacket and pill bottle and contacted Ecolab the next day, police said.

An Ecolab employee found bugs crawling around the store's men's fitting room and identified the infestation as bedbugs, police said.

Then on Saturday, a Walmart employee found a second closed pill bottle -- with several dead bugs inside -- lying on the floor of the men's department, police said.

The Walmart staff called the police who responded to the store and collected the bottle for fingerprint processing, authorities said.

Employees are reviewing store surveillance video, police said.

"Walmart reached out to other stores in the area and verified this has been an isolated incident," police said.

"Bedbugs are experts at hiding," according to the CDC, because they can slide into luggage, clothes, bedding, mattresses and bed frames.

They aren't known to spread disease but can cause itching and loss of sleep, according to the CDC.

A spokesperson for Walmart did not immediately respond to ABC News' request for comment.

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