Concerns about a potentially armed individual prompted a brief hold and secure at Petrolia's high school on Thursday.
Lambton OPP said officers responded to a disturbance at around 2:20 p.m.
During that time, Lambton Central Collegiate & Vocational Institute (LCCVI) went into a hold and secure, which lasted about 25 minutes.
OPP posted the advisory to social media shortly after 3 p.m.
"One individual is in police custody without incident, and no others are being sought. There is no threat to public safety," said West Region OPP in a social media post.
Police said no other details will be released at this time as the investigation is ongoing.
According to LCCVI's website, students are typically let out of period D at 2:20 p.m.
Sarnia News Today has reached out to the Lambton Kent District School Board for comment but did not receive a reply at the time of publication.
