(Portland, OR)  --  An investigation is underway into the discovery of roughly one-thousand needles across a nature trail in a park in Beaverton.  Police say the needles were found yesterday morning at Brookhaven Park.  KATU News reports the needles were the type of high-quality medical needles used on patients hooked up to an IV.  Police say they're still unclear on a motive but they suspect someone stole a box of needles from a medical facility and then dumped them after discovering they weren't hypodermic needles.