Four people were hurt in a shooting at Timberview High School in Arlington, Texas, Wednesday morning, authorities said.
The suspect, an 18-year-old student, fled the scene and was taken into custody hours later, authorities said.
Three victims were students and one was an older person who may have been a teacher, police said.
A family member confirmed to ABC News that one of the victims was Calvin Pettitt, who appears to be an English teacher at the school.
The shooting occurred around 9:15 a.m. in a classroom on the second floor of the school, police said.
Students are being escorted to another building to be reunited with their families, the Mansfield Independent School District said.
Texas Gov. Greg Abbott said in a statement: "Our hearts go out to the victims of this senseless act of violence.". »