Police have recovered a loaded gun from a Toronto Catholic high school and taken four students into custody Wednesday, after receiving a tip from Crimestoppers.

The gun was recovered by police around 2:30 p.m. Wednesday from Blessed Mother Teresa Catholic Secondary School in the city’s north-east end, John Yan of the Toronto Catholic District School Board said.

The four suspects include three males and one female, all either 16 or 17 years old, according to police from the city’s 42 Division.

Const. Tony Vella said officers received a Crimestoppers tip just before 2 p.m., that said a student had a gun in their bag. Police located the handgun in a knapsack.

The school was put under “hold and secure,” as police conducted a search, Yan told CP24. No staff or students were harmed and school was dismissed at its usual time of 3:30 p.m.

“At no point were students in any danger,” he said. “It was a very calm and students should be commended for their calm demeanor.”

Yan said the school will be reviewing its safety procedures, following the incident. Meanwhile, students are encouraged to speak to their teachers or the school guidance counsellors if they are concerned, Yan said.

Classes at the school will resume as usual on Thursday, he said.