Police say one person is dead after a car drove into a crowd of people in western Berlin.
A driver has been arrested and officers say they don't yet know if it was an accident or a deliberate act.
Firefighters say around 30 were injured.
Actor John Barrowman happens to be there, and believes he saw a terrorist attack - the actor has shared his experience on Twitter:
"The police presence is unbelievable, they are clearing out the area that was cordoned off. I heard the bang and the crash when I was in a store and we came out and saw the carnage, and there's helicopters coming in now to airlift people."
