Videos
Video shows the moment schoolchildren hid as a plain-clothes police officer knocked on the door of their classroom.

Four people were killed after a 15-year-old boy opened fire at his high school, while eight others – including a teacher – were injured.

This caption has been updated. It originally said a gunman tried to lure students into the hallway by pretending to be a police officer – this was incorrect.

SUBSCRIBE to our YouTube channel for more videos: http://www.youtube.com/skynews

Follow us on Twitter: https://twitter.com/skynews

Like us on Facebook: https://www.facebook.com/skynews

Follow us on Instagram: https://www.instagram.com/skynews

For more content go to http://news.sky.com and download our apps:
Apple: https://itunes.apple.com/gb/app/sky-news/id316391924?mt=8
Android https://play.google.com/store/apps/details?id=com.bskyb.skynews.android&hl=en_GB

Sky News videos are now available in Spanish here/Los video de Sky News están disponibles en español aquí https://www.youtube.com/channel/skynewsespanol

To enquire about licensing Sky News content, contact clipsales@sky.uk