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CHARLOTTESVILLE, Va. (CBS 19) -- Alexis Murphy tweeted "Burg Bound" to her more than 11,000 Twitter followers Saturday, and investigators say that's the last anyone has heard from the teen.

"She was en route to go shopping in the Lynchburg area," said William Mays, a detective with the Nelson County Sheriff's Office. "This was the last time she was seen by her family."

The 17-year-old from Shipman has been missing for two days. On Sunday, deputies with the Sheriff's office started investigating. On Monday, agents with the FBI and Virginia State Police joined the search.

"Alexis is very close to her family," said Mays. "She has never disappeared in the past. In fact, she was looking forward to playing in volleyball tournaments later this week and excited to start her upcoming senior year in high school."

Worried family members gathered at Tye River Elementary School Monday night, where investigators set up a command post and held a brief press conference asking for the public's help.

"This includes anyone who may have seen Alexis in her white Nissan Maxima...or anyone who has had any contact with her after 6:00 PM on this past Saturday," Mays said.

Investigators spent Monday searching houses and wooded areas in Shipman, while two state police rescue helicopters searched by air. Detectives did not take questions during the press conference. Anyone with information is asked to call 1-434-263-7050.

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Blue Ridge Life Magazine is reporting 17-year-old Alexis Murphy has reportedly been missing since this past weekend. She was believed to be heading to Lynchburg in a white 2003 Nissan Altima, license plate number WYN3706.

Call the Nelson County Sheriff's Officeat 434-263-7050 if you have any information.

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