A truck has rammed into a crowded Christmas market in Berlin and killed at least nine people.
Here's what we know so far:
1. The incident took place at a market outside the landmark Kaiser Wilhelm Memorial Church.
2. Pictures and TV footage show a large Scania truck with a smashed windscreen on the pavement next to market stalls, with a large Christmas tree toppled over. Ambulances are lining the streets and heavily armed officers are patrolling the area.
3. A suspect believed to be the driver has been arrested but police are still investigating whether or not it was an accident or an attack.
4. Berlin police tweeted that a passenger in the truck died at the scene.
5. The nine deaths have been confirmed by police, and a spokesman said that 50 people had been injured.
6. Local police are also urging people in the area to stay at home.
7. Some witnesses have described the crash as deliberate. Briton Emma Rushton, told Sky News that the lorry rushed past her and said "it was not an accident". She added that she thought the truck was travelling at 40mph and "showed no signs of slowing down". Mike Fox from Birmingham said the truck missed him by a few metres. "It was definitely deliberate," he said.
8. A Berliner Morgenpost reporter described the scene shortly after the truck crashed as eerily silent and said some injured shoppers sat in front of stalls and held each other.
9. The Foreign Office warned Brits travelling to Germany of a high risk from terrorism. In advice updated after the crash, it said: "There may be increased security in place over the Christmas and New Year period, including at Christmas markets and other major events that might attract large crowds. You should remain vigilant and follow the advice of local authorities."