Edit: Zero hedge changed the headline as it looks like those 7 people were only critically injured and not dead.

From an Austrian newspaper: https://www.oe24.at/oesterreich/chronik/wien/attentat-in-wiener-innenstadt-sechs-tatorte-passant-tot-ein-taeter-erschossen/452598589

10 attackers
6 locations
2-7 dead (including one of the attackers)
There's photos of police detaining "youths" which may or may not be suspects: https://twitter.com/Hartes_Geld/status/1323388863281324038
There's someone on Twitter claiming to be responsible (like that's worth anything): https://images02.oe24.at/123624267_1005086233324498_6122310266034405240_n.jpg/452.606.489

Edit: Some videos off Twitter:
https://twitter.com/Topfii12/status/1323363211014529025
https://twitter.com/arutz20/status/1323369755097653248
https://twitter.com/JAHAYYAT/status/1323386821791883265
https://twitter.com/PaulvonHind1847/status/1323350336447352833

Trying to find more information but German Twitter is a shitshow of lefties making excuses, saying not to jump to conclusions, ACAB and the most important thing right now is fighting hate speech.