A number of police cars arrived at the high school during C-block on Nov. 8 after a masked individual was reported to be in the vicinity of the building.

Police have confirmed that the suspicious person seen moving sandbags on Cypress Field was not a threat, according to Lieutenant Philip Harrington of the Brookline Police Department.

Headmaster’s secretary Kelli McDermott reported the suspicious person to the Brookline Police at 11:54 a.m. after two female students said they had witnessed a man moving “two dirty bags of sand on the field” 20 minutes before, according to the police report.

The report said the individual was described as wearing a black ski mask and a sweatshirt. McDermott reported that the subject was last seen approaching the quadrangle but had not been seen in the building.

Harrington said that most available units were dispatched to the school after the call, and the report said they arrived on scene at 11:58 a.m. At 11:59 a.m., a student reported to officer Michael Keaveney that they had seen the suspicious person enter the school 15 minutes earlier. After units swept the building, the subject was located and identified, according to the report. According to the Brookline Police Department’s Twitter page, the individual’s story “checks out; just a student dressed for cold weather.”

Headmaster Deborah Holman reiterated this in a loudspeaker announcement during F-block.

“Many of you may be wondering about the police cars that were outside of the building this afternoon,” Holman said. “The police were investigating something, but it turned out to be absolutely nothing. The police have left the building, and everything is fine.”

Miriam El-Baz and Rebecca Segal can be contacted at [email protected].