UPDATED Monday, Sept. 10: Authorities hope to identify a pair of hikers who dropped off a backpack at the ranger station Aug. 30, according to the Associated Press.

They think the backpack belongs to Diana Bober, and they hope the hikers who found the pack will let them know where they found it so searchers can garner a better indication of her last known whereabouts, according to the news organization.

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Diana Bober

Searchers are combing parts of the Mount Hood National Forest for a 55-year-old Gresham woman last seen Aug. 29 after her car was spotted Saturday near the Zigzag ranger station.

The search for Diana Bober began after her car was found around 3:30 p.m. Saturday. Crews fanned out from the ranger station to search for her, the Clackamas County Sheriff's Office said on its Twitter account. They resumed searching on Sunday.

Deputies haven't said what, if anything, they have found so far.

Gresham police asked for the public's help to find Bober on Friday, after she had been missing for 1 1/2 weeks. Police have described Bober as an active hiker who frequents Mount Hood.

At least one volunteer crew, the Mountain Wave Search & Rescue, is helping look for her. Searchers are also flying over the area and using K9 teams on the ground, according to search crew updates on Twitter.

There were also 34 ground searchers from Pacific Northwest Search and Rescue. Hood River Sheriff provided the plane and there was also a military aircraft searching as well. — PNWSAR (@pnwsar) September 10, 2018

Bober's family believes something might have happened to her while she was hiking, police said.

This is a developing story and will be updated.

-- Molly Young

myoung@oregonian.com