Someone decided to play an awful prank on Swifty, a World of Warcraft broadcaster with a half-million subscribers on YouTube. Some asshat watching his livestream decided it would be hilarious to call the cops and claim that Swifty was threatening someone with a knife. The police showed up during his broadcast, searched his house, and detained him for questioning.
Since everyone could see him playing World of Warcraft, it's clear that no one was actually being threatened. According to Massively, this isn't the first time that someone has pulled this kind of stunt on Swifty. I really hope that they can get to the bottom of this, and that Swifty can go back to playing videogames without being harassed.