An empty holster found outside Starpoint High School delayed classed for about two hours on Wednesday morning.
Niagara County Sheriff's deputies were called in about 7:15 a.m. Wednesday after school officials reported finding the holster.
The school was put on lockdown and more than 1,400 students were kept on their buses as deputies searched the school.
While conducting the search, the owner of the holster, a police officer, according to Channel 4 News, called and explained he had dropped the holster while attending a sporting event at the school on Tuesday night.
The officer, who was off duty at the time, told deputies he accidentally grabbed the holster while taking other items out of his vehicle and must have dropped the holster while walking into the school.
Arrangements were made for the holster's return. No charges will be filed.