Tragedy as 14-year-old 'straight A' student shoots a 16-year-old girl and then takes her own life inside Texas high school bathroom

A student is injured and a female gunman is dead after a shooting at a high school in West Texas.

Alpine High School was placed on lockdown after reports of an active shooter Thursday morning, around 9am. 

The Brewster County Sheriff's Office says a 14-year-old female student brought a semi-automatic pistol 'with plenty of ammunition' to school and shot another female student in the band hall bathroom, before turning the gun on herself to commit suicide. Neither the victim or the shooter have been identified. The victim is believed to be 16 years old. 

The shooter's grandparents said she was a straight-A student and there were no indications of trouble at home. She had only been living in the town for six months. 

A Homeland Security agent responding to the scene was also injured when a U.S. Marshal accidentally shot him outside the school.

The sheriff's office previously said that as many as two gunmen were attacking the school, but they are no longer searching for any other suspects.

The student and Homeland Security agent who were injured have not been identified. Both are being treated at Big Bend Medical Regional Center and are expected to survive.  

The student victim, who was shot in the lower back, was reportedly strong enough to run outside and flag down a car to take her to the hospital.

A spokeswoman for Big Bend hospital said doctors there are are tending to three 'victims'. It's unclear who the third victim is.

It appears that police were in the school by the time the shooter committed suicide. Police say that when they arrived at the school, they heard gunshots and found the female shooter dead in the bathroom. At first, they thought the shooter was actually a victim.  

It's still unclear what sparked the shooting on Wednesday.

A student at the school, whose friend was shot, told CBS 7, 'There was blood all over the hallway'. 

A junior told CNN that second period had just started when a teacher outside her class began yelling 'Get in the classroom!'

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

Later, a law enforcement officer banged on the classroom door and escorted the children out of the building.

'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.'

The student added: 'It was so scary and very intense. I've never been so scared in my life.'

Student Taylor Hunt told CBS 7: 'We all thought that Alpine would be a place where [this] wouldn't happen and then it did happen.'