Fairfield Warde High School opened as usual Friday morning, a day after a "bomb threat" note was found written on a desk after hours.
School officials, however, limited the number of entrances to the building as a way to step up security, and extra police patrolled the property as a precaution.
"Going to bomb school" was scribbled on a desk Thursday after classes had ended for the day, police said, and an investigation was launched.
The incident came the same day a similar threat was discovered scrawled on a wall at the local Home Depot store, but Police Chief Gary MacNamara said investigators do not believe they are related.
After the investigation by both local and state police, the Warde threat -- like the earlier one at Home Depot -- was determined not to be credible and classes went forward as usual at Warde and the town's other schools.
"We took steps and measures to make sure the school was safe," MacNamara said, and worked with the school district, which made the decision to keep schools open Friday. He said parents of all students were notified via email by the Board of Education.
"This is still ongoing and we want to determine who made the threat," MacNamara said, "and we are looking for the assistance of other students."
He said although it was believed from the onset that the threat was "less than credible," the department still was obligated to investigate it and ensure the safety of the school.