Stamford High School was placed on a brief lockdown Friday after a report of a suspicious person on campus turned out to be a resource officer, school officials say.

Stamford's Emergency Management and Emergency Communications Center wrote in a tweet just after 8 a.m. saying, "Stamford High School is on lockdown for suspicious person. Lockdown will be lifted due to the person being a School Resource Officer. All clear."

Mayor Caroline Simmons released a statement saying, "Earlier today, Stamford High went on lockdown after a new staff member reported to the Stamford Police Department that they saw someone with a gun in the south parking lot. The individual in the parking lot was quickly identified as a Stamford High School Resource Officer who was reporting to work. We recognize that this incident created concern among families and in our school community. Stamford Public Schools staff are trained to be vigilant about safety, and their vigilance is understandable. We apologize for any alarm or inconvenience that resulted from this incident."