Four people have been wounded after a gunman opened fire at Timberview High School in Arlington, Texas, on Wednesday morning.
Police say shooting began after a fight broke out in a classroom and a student opened fire.
They named Timothy George Simpkins, 18, as a “person of interest” and said law enforcement was searching for him.
He is believed to be travelling in a 2018 silver Dodge Charger.
Three people were taken to hospital with two suffering gunshot wounds, and one suffered minor injuries.
Arlington PD provided an update on their conditions on Wednesday afternoon to say a 15-year-old male was in a critical condition.
A male, 25, and a teenage girl were described as being in a good condition. The fourth victim had already been treated.
“This was not a random act of violence,” Kevin Kolbye, assistant chief of Arlington Police, said at a press conference.
“I have a high confidence there was only one shooter.”
Police arrived shortly before 11.30am after receiving reports of an “active shooter” on the loose at a high school in the Dallas-Fort Worth area.
Police said four people were injured, three were injured, and on sustained minor injuries.
The local school district wrote to parents to say the school is in lockdown and police are investigating an “active shooter situation” at the high school.
Just after midday, the Mansfield Independent School District gave the “all clear” to say the immediate danger was over.
Students and staff who had been under locked in their classrooms and offices were being “safely escorted to buses”, the Mansfield Independent School District told parents.
Arlington police and neighbouring law enforcement agencies responded to the incident.
At 11:30am, Arlington Police Department said it was on the scene and conducting a “methodical search” of the school.
In a video posted to TikTok reportedly taken from inside a classroom at Timberview High School, three shots were fired in quick succession.
Students could be heard gasping, and took cover as the shots rang out.
CBS posted a photo of desks and chairs barricading a door to a classroom.
Parents rushing to the school to find their children are being directed to a nearby building at 151 Mansfield Webb Road.
Law enforcement took pictures of the students as they boarded buses to be reunited with their parents.
About 1,900 students from 9th to 12th grade attend Timberview High School.
