Canada was rocked by a gun attack at a high school. At least 10 people were killed. Foreign media have published footage moments before the serious attack took place.
As can be seen from videos published on social media, alarmed students run to leave towards premises where police vehicles are also parked.
Immediately after the event, police officers surrounded the area, and the site was monitored from the air by a helicopter.
At least 25 people were injured during the attack.
