ARLINGTON (CBSDFW.COM) – Lamar High School in the Arlington Independent School District was placed under lockdown for hours on Tuesday after reports that a student may have brought a handgun to campus. Another student informed a resource officer at the school about the situation.

“Upon receiving this information, we immediately responded to verify the credibility of this allegation,” said Sgt. Christopher Cook of the Arlington Police Department. “The Arlington Independent School District placed the school in lockdown while we continue to investigate the credibility of this incident.”

The school was placed on lockdown just before 9:00 a.m. and remained that way for more than three hours. Arlingotn police searched the entire school, room to room and even brought in K-9 officers to search lockers and common areas.

According to school district spokeswoman Amy Casas, a lockdown situation effectively means that nobody was permitted to enter or exit the campus.

Just before 12:30 p.m. an Arlington ISD spokesperson confirmed the lockdown had been lifted and no weapon was found. Administrators said police in Arlington are also “confident that the suspect is not on campus.”

A regular school schedule has resumed but the campus will be closed for lunch, with all students required to eat in the cafeteria on a staggered schedule. With the lockdown over parents are being allowed to pick up their children if they wish.

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