alpine high school
One student reportedly shot another in the incident at Alpine High School in Texas on 8 September 2016 Google Streetview

A female student is dead and another student has been injured in a shooting at a high school in Texas, according to media reports. Alpine High School in Brewster County was placed on "critical lockdown" after a female student reportedly opened fire on another at around 9am local time on Thursday (8 September).

A police officer was also accidentally shot by a marshal as officers responded to the incident, CNN reported. The conditions of the two injured people have not yet been released.

US news channel News West 9 said a female died of a self-inflicted gunshot wound, claiming she turned the gun on herself after shooting and injuring another student.

Local newspaper the Alpine Avalanche showed images of students at the high school apparently being evacuated as officers searched the area.

A junior at the school told CNN that students had just started the day's second period when a teacher outside her class began yelling, "Get in the classroom!"

"My teacher... yelled to everyone to get into the closet," the schoolgirl said. "We heard someone yelling and running down the hall. We all started crying."

A short while later a police officer banged on the classroom door and ushered the students out.

"There was blood on the floor in the cafeteria that I saw when we went past it on our way out of the school," the student said. "One of the officers told us to keep our hands up and run out of the building, so I only saw the blood quickly.

"It was so scary and very intense. I've never been so scared in my life."

Alpine High School is located in the remote town of Alpine, about 200 miles south-east of El Paso, and has just 280 students enrolled. Classes for the new year began about two weeks ago.