MERCEDES, Texas (ValleyCentral) — A security guard who works at the Mercedes Independent School District has been arrested for allegedly making a bomb threat last week.

Edgar Aaron Estrada Jr., 22, was arrested on a charge of terroristic threat and false alarm or report, according to the Mercedes Police Department.

According to a release from the district, Estrada is “not an employee of the Mercedes Independent School District. He is an employee with… MLG Security Services.”

The district went on to state that Mercedes police will be investigating the incident. No other details were provided.

On Thursday, May 26, students and staff were evacuated from Mercedes High School after a bomb threat was made.

Police learned that the threat was made through the communication radio frequency that administrators and security officers use for their radio. A “robotic” voice delivered a bomb threat over the radio.

Students and staff were then evacuated to the Mercedes Football Stadium, and Weslaco AMBUS, Mercedes EMS, Mercedes Police Department, and McAllen Police Explosive Ordinance Disposal responded to the scene.

Mercedes police told ValleyCentral.com that Estrada had access to a radio and broadcasted the threats. He was arrested at his house on Thursday.