FBI Joins Search for Missing Math Teacher

The search for Sherry Arnold continues as agents retrace her final known steps.
1:35 | 01/12/12

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Transcript for FBI Joins Search for Missing Math Teacher
And police are now going door to door in Montana hoping to track down a popular high school teacher who vanished five days ago she went out for her morning job. And never return now people in town are worried about their own safety here's ABC's -- and bill. ABC news was there exclusively as police hit the streets of Sydney overnight. Desperate to shake loose new leads we're doing -- door -- -- -- for our carrier our. On Wednesday FBI agents went back to the school where Sherri Arnold teaches -- they interviewed the entire faculty. They're tracing the path she -- before she disappeared Saturday checking surveillance cameras. Tips from the public even have cops scrutinizing the travel plans of people who might know something. Anything we want to know who was in town who possibly have left but with no answers to what happened to Arnold this normally peaceful town is living in -- Pepper spray we've been selling in four's and five's. People would like some of the minute can we get -- in. -- Johnson's hardware small handgun sales have tripled. We're getting down to the bigger -- slept all the little stuff pretty much sold everybody's just nervous -- just kind of on -- -- disappearances also fueling tensions between locals and the flood. Out of towners working in Montana's booming oil industry when there and in groups -- -- they've been a little threatening at times. Especially for women in a town that never used to -- its -- Everyone now wants keys. For Good Morning America Clayton -- LA BC news Sidney Montana.

This transcript has been automatically generated and may not be 100% accurate.

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