SPRING, Texas (AP) — A 17-year-old male student has been charged with murder in a deadly knife fight at a Houston-area high school.

A Harris County Sheriff’s Office statement says Luis Alonzo Alfaro was charged in the fight at Spring High School that killed a student Wednesday.

The stabbing happened during a fight between several students in a school corridor. The sheriff’s statement says that during the fight, Alfaro pulled a knife and stabbed a 17-year-old student to death and wounded three other students. The three survivors were treated at a hospital and discharged.

The statement says Alfaro admitted the stabbing under questioning by sheriff’s homicide detectives.

School district officials have canceled classes at the high school for the rest of the week.

“We believe a confrontation of some sort occurred ... that ultimately led into a physical confrontation that produced weapons,” Sheriff Adrian Garcia said. “There has been some information that this may have been gang related.”

Two victims were hospitalized with minor injuries. A third, identified only as a 16-year-old, was in surgery. No other information was available on the teenager who was killed.

Garcia said a “cutting instrument” was used in the attack but offered no details.

Some parents said the fight was the continuation of a disturbance that broke out Tuesday. Officials at the school, which has about 3,500 students, would not confirm their comments.

“Every parent sends their child to school believing school should be one of those safe haven places,” Spring Independent School District Superintendent Ralph Draper said. “This is what we spend our nights and days working toward and what I lose sleep over.

“In my nearly 30-year career, this is the one thing you pray never to experience.”

Parent Tara Campbell said she received text messages from her daughter about the fight and that her daughter said students who witnessed the episode snapped cellphone photos of the victims as they lay on the ground.

Campbell said she intended to have her daughter home-schooled, saying she’s grown tired of fights at the school.

“Last year there were gang fights consistently,” she said. “This is ridiculous. This is an ongoing situation.”

Lakesia Brent said her son, a sophomore at the school, sent her multiple text messages asking her to come pick him up.

“He’s just afraid,” she said, adding that fights at the school were a problem in the last academic year.

The school was placed on lockdown following the stabbings, which occurred about 7 a.m., and students were released to the care of their parents later Wednesday.

Many parents were upset that the school district did not provide them information in a timely manner.

Draper defended the district’s actions, saying they focused on two goals — securing the school and making sure no action was taken to compromise the investigation — before communicating information to parents about what had happened. He said students were not immediately released because some of them were potential witnesses who needed to be interviewed by investigators.

“When street violence pours into the school, it compromises the safety of all our students,” Draper said.