What are some things to do and see in Vienna? I'm traveling there with a few friends and we're looking for recommendations. We like food and drinking, shopping and walking around, but we're open for anything.

(Thank you, everyone who recommended things to do in Munich and Prague, we had a wonderful time in both cities)

Short Summary:

• On Monday, approximately 20:00 local time, public shootings occured at multiple places in Vienna, Austria.
• 4 deaths in total, one perp, 3 civilians. 15 people are severely injured, including one member of the police.
• Attacker(s) is/were armed with a rifle and several handguns, and were wearing a dummy explosive vest.
• The dead perpetrator has been investigated over the night, identified as a sympathisant of IS ("Islamic State"). There have been multiple arrests and house searches of the people surrounding this person by Austrian SWAT (Kobra).
• Schools are closed on Tuesday (today).
• In total, six places have been hit: Morzinplatz, Salzgries, Seitenstettengasse, Graben, Bauernmarkt und Fleischmarkt
• The police is still currently working with military support.
• Locals are urged to stay home today and it's difficult to get reliable updates.
• The police has asked the public to refrain from posting videos/pictures on social media, and instead send it to them, as posting material could endanger the police and military working.
• Multiple perpetrators are possible, but not confirmed.
• The attack is currently considered to be an Islamic terror attack.

Best place to get news: @LPDWien (local police department Vienna) on Twitter: https://nitter.net/lpdwien They post relevant information in both English and German.