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FOXBORO - Foxboro High School was locked down for almost two hours Monday morning and two students were arrested after a live bullet was brought into the school.

Police did not find a gun associated with the .357-caliber round after searching all lockers, open areas, the auditorium and the library, and after talking with several students, Police Chief Edward O'Leary said.

Police arrested two Foxboro High seniors, including the one alleged to have brought the bullet to the school's main office, O'Leary said.

Police charged Freddie Brito, 18, of North Street, and Sarah Musgrove, 17, of Hallowell Road, each with possession of ammunition without a firearm identification card and disruption of a school, O'Leary said.

The students are scheduled for arraignment today in Wrentham District Court, the chief said. Acting Superintendent Jan Norton said no other students are suspected of being involved in the incident.

The school was locked down from 9:37 to 11:13 a.m., after the arrests were made.

Additional police officers will be at the school today "in order to supply a sense of assurance and additional security," Norton told parents in a letter she sent home with students.

Also, counselors will be available to help any students seeking reassurance of their safety, Norton wrote.

"I know that this kind of situation can cause anxiety and apprehension. The police believe that there were no accompanying threat indicators; the likelihood is that the bullet came into the school without a gun," she wrote.

Police and Norton initially reported that a student had found the bullet in the first-floor hall and then brought the round to the main office, where he showed it to Assistant Principal Joseph Heinricher.

However, O'Leary said police now allege Brito brought the bullet into the school, where he "showed it to the young woman," Musgrove, in a first-floor hallway.

Musgrove then allegedly gave the bullet back to Brito, who brought it to Heinricher, O'Leary said.

Principal Jeffrey Theodoss then called 911 and Norton.

Norton said a secretary announced over the school's intercom that the building was in lockdown mode. Students were not allowed to leave their rooms, Norton said.

A police cruiser blocked the high school entrance on South Street to pedestrians as well as vehicles.

Norton said lockdown drills made Monday's incident run smoothly.

"Staff immediately began to lock the doors, turn out the lights and no students came and went," she said.

Area schools have adopted a zero-tolerance policy regarding firearms and ammunition following the April 4, 1999, Columbine High School massacre in Colorado.

Last December, Dighton-Rehoboth Regional High School locked down after three bullet were found in a hallway during the school day. A follow-up search by state police with a dog failed to find anything else suspicious.

The Foxboro incident comes in the wake of a fatal student stabbing Jan. 19 at Lincoln-Sudbury Regional High School.

Police revealed late last week that the student charged in the killing, 16-year-old John Odgren, had earlier brought a pocketknife to the school and showed it to a school psychologist, but that the incident went unreported to other school officials or police.

Norton said Foxboro High demonstrated its zero-tolerance for such incidents by "immediately going into lockdown."

"We did such a thorough search and interviews, and within two hours we found the students who were (allegedly) responsible," Norton said.

MICHAEL GELBWASSER can be reached at 508-236-0372 or at mgelbwasser@thesunchronicle.com.