A search of Hingham High turned up nothing after Hingham High School was placed on lock down Friday afternoon, following the discovery of a threatening message written on a boys restroom wall.
The lock down finished up around 3 p.m., with Hingham Police canines doing a sweep through of the school, Lieutenant John Nirkaitis said.
A bulletin alerting parents came out shortly after that, reporting that officers from the Hingham Police Department and gun-sniffing canine units from nearby law enforcement agencies conducted a sweep of the school's lockers, corridors, and classrooms.
During the sweep of the building, nothing unsual was found.
"You just have to be careful nowadays," said Hingham High Principal Paula Girouard-McCann in an interview. "It was a disturbing message and [police] thought they should come in, do a lock down...It’s a good exercise for us, and them, and everyone is safe."
School was not disrupted during the lockdown, and classes continued while the search was being conducted.
Hingham High staff said they are continuing to look for who is responsible for the graffiti.
"If anyone has any information about the person or persons who did this, please let me know. Those involved will be dealt with very seriously," Girouard-McCann said in the bulletin to parents.
Friday's incident was similar to one on March 6, when a note found in a bathroom said there was a bomb. No bomb was found, and a culprit was never identified.