(CNN) Authorities are searching for a missing soldier stationed at Fort Hood who hasn't been seen since Wednesday.

Vanessa Guillen, 20, was last seen in the parking lot of her barracks at the Fort Hood Army post in Texas on April 22 around 1 p.m., according to a news release from the United States Army Criminal Investigation Command (CID).

A $15,000 reward for information leading to Guillen's whereabouts is being offered by CID, a tweet from Fort Hood said Monday.

Keys to her car and room were found in the armory where she was working earlier in the day along with her identification card and wallet, the release said.

An extensive search has been launched for 20-year-old solider Vanessa Guillen, who has not been seen since Wednesday.

Guillen, a private first class, was last seen wearing a black T-shirt, according to the release.

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