https://apnews.com/bebbbf37bcf34820ba4488e0e72b7789

SEATTLE (AP) — The attacker who killed two people in a shooting at a German synagogue live-streamed the assault on Twitch, a video service owned by Amazon. It was one of the first violent attacks streamed on the service, which is best known for letting people watch others play competitive video games.

Here's what you need to know about Twitch.