O.D. Wyatt High School in Fort Worth was under a lockdown Monday, the first day of classes, after a photograph of a student with a firearm on campus was reported, according to Fort Worth ISD. 

Officers responded to reports of a person with a weapon shortly at the school shortly before 2 p.m. A student called her parent and told them that someone had a gun at school, Fort Worth Police Spokeswoman Cynthia Wood said. The parent then called the police.

Once there, police were told a group of five juveniles had been seen in a photo displaying a gun. The five people, including the student who took the photograph and one adult, were arrested, police said.

Police said the adult, whose identity wasn’t publicly released, had possession of the gun seen in the photograph.

Students were being released from the school as of 4:14 p.m., Wood said.

Fort Worth ISD officials said students and staff are safe, and the lockdown was initiated as a safety precaution while Fort Worth police continue their investigation. School officials implemented a slow release of students through metal detectors to ensure continued safety.

The police department and school district are working together and will provide additional information as the investigation continues, according to the statement. “The safety and well-being of our students and staff remain our highest priority,” the statement reads. 

Monday marked Fort Worth ISD’s first full day under state intervention, a change that caused parent pushback and hundreds of teacher resignations. The Texas Education Agency first began the intervention in March, appointing a new superintendent and board later that month.

Many other school districts, such as Dallas ISD, Prosper ISD and Plano ISD, begin school Tuesday. 

During a 5 p.m. news conference, schools Superintendent Peter Licata thanked the students and parents who made the school district and police aware of the photograph, which he said was posted on social media. The news conference was previously planned to discuss the first day of school.

Licata also said that no weapons were found on campus, and the students arrested will not return to school until the investigation is completed. He asked students to “not kid around about safety,” as they investigate whether the photos were real or not.

“If it is our student, and they are posting it and it is real, they are going to be met with the full consequences of the law,” Licata said.

Staff writer Jessica Ma contributed to this report.