NAPERVILLE, Ill. (CBS) — Police in Naperville are searching this morning or a man who stole prescription drugs from the pharmacy at a K-Mart store.

As WBBM Newsradio’s Dave Berner reports, police say the K-Mart entered the pharmacy at the K-Mart at 1199 E. Ogden Ave. and in a fashion similar to a bank robber, he handed over a note with demands. In this case, the demands were for specific controlled substances.

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LISTEN: WBBM Newsradio’s Dave Berner reports

The robber made off with quantities of Fentanyl and Oxycodone and then fled on foot east through the store’s parking lot, Naperville police Sgt. John Westlove said.

Police searched the area but could not find the man, Westlove said. No weapon was displayed during the holdup and no one was injured.

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Fentanyl and Oxycodone are synthetic, narcotic pain relievers. Fentanyl is nearly 100 times more potent than morphine, and was used to increase the potency of a batch of heroin that ended up causing dozens of deaths in Chicago in 2006.

Westlove said the robber was described as being as white man between the ages of 18 and 25 who stands about 6 feet tall and has a medium build. He has a tattoo below his left eye and was wearing dark-colored clothing, Westlove said.

Witnesses to the robbery or those who believe they have information about the case were asked to contact the police investigations section at (630) 420-6726; or Naperville Crime Stoppers at (630) 420-6006. Callers can remain anonymous.

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The Naperville Sun contributed to this report, via the Sun-Times Media Wire.