The US Embassy in Vienna has issued an "Urgent Security Alert" on its website and social media accounts, after a suspected terror attack in the Austrian capital.
The alert reads:
"There is an ACTIVE SHOOTER incident the Vienna 1st district near the area of Schwedenplatz near Sterngasse. Active gunfire. Police are present and engaging. All residents are urged to stay inside until further notice."
It also advises people to avoid the area, follow local authorities' instructions, and monitor local media for updates.
Similar messages have been posted or retweeted on the US Embassy Vienna's social media account, warning of an active shooter situation.