GRIFFITH — Police said Tuesday they are continuing to investigate a threat against Griffith High School.
A Griffith Public Schools employee discovered graffiti Friday in a bathroom at Griffith High School, police Cmdr. Keith Martin said. The message contained a vague threat of a shooting that was to take place Monday.
Police immediately began an investigation, and extra patrols were added Monday at the school campus, he said.
Extra patrols also were added Tuesday and will continue until officials determine they're not necessary, Martin said.
George Jerome, director of finance and operations for Griffith Public Schools, said school administrators decided against putting the school campus on lockdown or lockout.
"We had an increased police presence," he said.
Unlike the bomb threat several months ago that led administrators to close schools, Friday's threat "was more in the nature of a prank" because of how it was communicated, Jerome said.
The school district notified parents of the threat over the weekend, he said.
Employees checked school bathrooms for any additional graffiti before school Monday and during all passing periods, he said. Nothing was found.
A school resource officer, police detectives and administrators also monitored halls, he said.
About 1/3 of students were not in school Monday, but there was no difference in teacher absences from the week before, he said.
"It was a pretty calm day," Jerome said. "The day went as well as expected."
Police have interviewed people, but no one was in custody as of Tuesday morning, Martin said.
The investigation is ongoing.