KGW News reported the latest incident took place Thursday night at a Starbucks in Lake Oswego.
Sgt. Jay Weitman of the Lake Oswego Police Department said similar incidents were reported in Tualatin and Tigard over the past few days.
Officers are looking for surveillance images and asking the public to help track down the man "before he commits potentially more serious criminal acts."
Police describe the suspect as a white man is in his 40s or 50s with thinning blonde hair and a pot belly. He was last seen in a charcoal, older-model sedan, possibly a Honda or Ford.
Anyone who has seen him should call police at 503-635-0238.
Information from: KGW-TV, http://www.kgw.com/
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