Four people were arrested at a school in Ottawa's Overbrook neighbourhood Monday morning after Ottawa police got a call reporting someone with a firearm inside the building.
It happened at Ottawa Technical Secondary School on Donald Street, according to the Ottawa-Carleton District School Board.
Officers were called to the scene west of St. Laurent Boulevard at about 9:45 a.m, police said.
Nothing had been recovered by early Monday afternoon, police later said. The force said it was scaling back its presence in the neighbourhood, but that a criminal investigation is ongoing.
There was no word about any charges.
A lockdown was initiated as a precaution after reports indicated a student "may have been in possession of a weapon," said school board spokesperson Darcy Knoll in an emailed statement.
"Students and staff were safely secured in their classrooms and the lockdown was lifted after approximately an hour. No students or staff were harmed," the statement read.
Still, some students were left frightened.
Spencer Hudson, 16, said he had no idea what was going on when police entered his Ottawa Tech classroom armed and began patting down students, including himself.
"[It] was very stressful. Like I was shook up," Hudson said. "I was shaking like crazy."
Grade 11 student Brianna Blondin, who also witnessed police search her classroom, said the situation was scary but "everybody's just glad that it all ended."
In a series of tweets, police had earlier said there was no danger to the public and the school was in "safe and secure mode."
Police asked people to avoid the area but didn't originally specify what the call was about.