Authorities charged three teenage girls Wednesday after they allegedly wrote a gun threat on a bathroom wall of a middle school last week.

The girls, whose ages were not released, were charged with fourth-degree property damage and disorderly conduct — both petty misdemeanors — shortly after they were arrested Wednesday afternoon.

The juveniles were initially arrested on suspicion of first-degree terroristic threatening, police said

The case will be handled by the Family Court, where the proceedings are confidential because the suspects are minors.

Five schools — Campbell High School, Ilima Intermediate and Kaimiloa, Pohakea and Ewa Beach elementary schools — were placed on lockdown for a little more than an hour March 4 after school administrators reported a threat written on a bathroom wall.

Students were kept in classrooms from 10:15 to 11:35 a.m., just before lunch, the Department of Education reported.

Photos posted on social media accounts of the threat included a crude drawing of a gun firing at stick figures. The graffiti message alluded to an “m9 beretta” and warned to “Watch out, 11:05 a.m.”

Also, the state Department of Education increased the presence of security personnel and police at Castle High School in Kaneohe and nearby areas March 4 after school officials were made aware of a reported threat made the previous day.