The shooting reportedly took place at Italy High School in Texas.
Newsradio 1080 KRLD has been in contact with city officials, and with the county sheriff, and they describe the scene as "very chaotic".
A shooting has been reported at a high school 45 minutes south of Dallas, Texas.
ECSO posted to Facebook an update saying students, under police guard, were being moved as the investigation continues.
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The injured girl, whose name was not released, was taken to hospital in Dallas, about 70 km north of Italy town.
It was unclear whether the shooter and the victim knew each other.
Cassie Shooks spoke with Newsradio 1080 KRLD about what she saw when she arrived at the school this morning. Both teens were students at the school. Her condition is not known.
Students from nearby Stafford Elementary School have also been evacuated.
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Joffre says the district is working to reunite parents with their children. He said it was also working to make sure grief counseling was available for students.
Italy has a population of about 2,000 people and calls itself "the biggest little town in Texas".
This item has been corrected to show the sheriff's official is named Sgt. Joe Fitzgerald, not Sgt. Joe Fitz Fitzgerald.
The shooting happened at the Italy High School, the Austin American-Statesman reports.
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