A Western Heights Middle School seventh-grader has been charged in two of three incidents of written threats last week.
The third incident is being investigated, police said.
According to Hagerstown Police Department Sgt. Paul Kifer, the boy is accused of creating graffiti that prompted evacuations of the school Tuesday and Wednesday afternoons. The police responded to the scene about 1:05 p.m. Tuesday and 1:12 p.m. Wednesday.
The police are investigating a similar incident that occurred Thursday.
They also are attempting to determine if there is a link between the Tuesday and Wednesday incidents and one that occurred Sept. 8, Kifer said.
A letter that was sent home with students Tuesday and Wednesday from the office of Principal Jennifer Ruppenthal called the evacuations precautionary and asked that students report any information about the incidents or other threats to the police, school personnel or parents.