Finland School Shooter, 12, Wore Mask And Noise-Cancelling Headphones

On Tuesday morning, a 12-year-old boy opened fire at his school in Vantaa, Finland's fourth-largest city.

Finland will fly its flags at half-mast on Wednesday to mark the country's mourning after a 12-year-old opened fire at a school, killing one classmate and seriously injuring two others.

All public buildings and institutions will lower their flags from 8:00 am (05:00 GMT), the Interior Ministry said on its website.

The ministry encouraged the whole country to participate in the event.