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An 18-year-old woman was walking her dog on a wooded, waterfront trail in Sellwood Riverfront Park when a man emerged from some bushes and demanded her property at knifepoint on June 21, 2016, police said. The woman wasn't injured.

(The Oregonian/OregonLive/file)

A man tried to rob an 18-year-old woman and pulled a knife on her Tuesday morning in Sellwood Riverfront Park, police said.

The woman was walking her dog toward Oaks Amusement Park on a wooded, waterfront trail when the man emerged from some bushes and demanded her property, Portland police said in a news release. She told police that the man grabbed her arm and then showed a pocketknife while demanding her property.

Tips for people who ride, run or walk alone

* Be aware of your surroundings.

* Consider carrying a phone.

* Keep one ear free to listen to your surroundings if you're listening to music.

* Let someone know where you're going and when you expect to be back.

Source: Portland Police Bureau

The woman didn't have anything with her, police said. She ran back toward the park and to a friend's house. She wasn't injured.

Officers responded to the area around 10 a.m. and searched for the man, but they didn't find him.

He's described as being in his 20s, having a skinny build and being about 6 feet tall. He has light brown hair and may have a beard or goatee. He was wearing all black: a mask, hoodie, cargo pants and shoes.

Police ask anyone with information about who the man is to call the bureau's non-emergency line at 503-823-3333. Callers should reference case No. 16-197641.

-- Jim Ryan

jryan@oregonian.com

503-221-8005; @Jimryan015