At least four people have been injured in a shooting at a high school in Arlington, Texas.

The incident was reported around 9:15 a.m. on the second floor of Timberview High School.

Authorities say three people where shot and taken to an area hospital, while a pregnant teacher who reportedly fell during the altercation, was treated at the scene.

Witnesses say the shooting began as an argument between two students which escaladed to the shooting.

The gunman has been identified as 18-year-old Timothy George Simpkins.

Officials are reporting that after the shooting Simpkins fled the area in a 2018 silver Dodge Charger with the Texas license plate PFY6260.

Multiple agencies including FBI agents are currently searching the area for him.