Someone sent an email to the police saying he had killed his partner and was going to suicide. Guessing that German police has little experience with swatting.
Pretty much yeah. SWAT'ing is doable pretty much anywhere that you have a functional PD, and all you have to do is call in a credible threat - "I shot someone, I have hostages" etc.
It's unfortunately common, and most PD's also don't have any way or system in place for you to inform them that this is likely to happen ahead of time. In fact there are people who get SWAT'd multiple times a week, and the PD shows up every time all gung ho. In one case I know of, the police started threatening to charge the victim for all the false calls.
But yeah. Someone can just call the police on you and they come and arrest you.
> and all you have to do is call in a credible threat
Doesn't even have to be credible. Working as a paramedic, I saw first hand several SWATings that were the furthest thing from credible:
"I'm standing in front of the house and they have a family lined up and kneeling with their hands on their heads and men in balaclavas standing behind them with guns, upstairs" (the house in question is one story). "What color is the house?" "Brown" (it's actually blue). How do you see people kneeling in the middle of a room upstairs from the street - what, do they have the lights on, and all the curtains and blinds open? And that sounds more like "something I saw on a movie once".