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The shooter was female, Brewster County Sheriff Ronny told Alpine Radio. Five shots were fired.
The police officer was shot during a friendly fire incident, according to the Alpine Avalanche.
Alpine has a population of about 5,900 people, and there are approximately 280 students at the city’s only high school. The independent school district has around 1,000 students.
The rural city is about two hours southwest of Odessa. It is the county seat for Brewster County.
High school students are being evacuated and will be released once the all-clear is given, the Alpine Avalanche reported.