Mahopac High School was on lockdown for more than three hours Friday morning after two bullets were found in a school bathroom, officials said.

Law enforcement officials declared the building safe and ended the lockdown at 11:30 a.m. Students and faculty at the high school on Baldwin Place Road had been ordered to remain in their rooms since after the 8 a.m. report of the bullets, Putnam County Sheriff's Capt. William McNamara told Newsday.

"There's been no threat," he said. "No one's been harmed."

No other ammunition or weapon has been found at the school, according to McNamara.

More than a dozen Putnam County sheriff's deputies were at the school Friday morning, as were members of the Carmel Police Department, McNamara said. K-9 units from the Westchester County Public Safety Department were called in to help search for any additional ammunition or weapons.

Mahopac High School houses about 1,000 students and faculty.

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McNamara declined to describe the bullets, citing the ongoing nature of the investigation. It was unclear if the bullets were found in a student or faculty bathroom and by whom, he said.

"Really, the lockdown is a precaution to allow for the safe and orderly search of the school," McNamara said.

The lockdown comes a day after two other school incidents put Hudson Valley educators and students on edge.

A 16-year-old former Somers High School student who now attends a Rockland County residential treatment center was charged Thursday by State Police with a misdemeanor after allegedly posting a threat on Facebook to bring a gun to the school, which he attended as a freshman two years ago.

Also on Thursday, police were called to Greenburgh Academy in Irvington, a school for students with psychiatric and behavioral issues, after a 13-year-old student reportedly threatened to blow up the facility.