Police are investigating after someone released live bedbugs inside a Pennsylvania Walmart.

Investigators say a small pill bottle with live bedbugs inside was left inside the pocket of a jacket inside a men’s changing room.  More bedbugs were found crawling around the dressing room area, and a second bottle containing dead bedbugs was also found in the men’s department.

While bedbugs do not spread disease, they can cause itchy bite marks and are notoriously difficult to exterminate.