A truck ploughed into a busy Christmas market in Berlin on Monday, killing at least 12 people and injuring dozens more in what police said was a suspected terror attack.

Ambulances and heavily armed police rushed to the area after the vehicle mounted the pavement of the market in a square popular with tourists, in horrific scenes reminiscent of July's deadly truck attack in the French Riviera city of Nice.

"I don't want to use the word 'attack' yet, although there are many things pointing to one," Interior Minister Thomas de Maiziere told public television.

As witnesses described scenes of panic and carnage, police said at least 12 people were killed and 48 others were injured in the incident, which came less than a week before Christmas.

A German police spokeswoman told AFP that a man who was apparently driving the truck had been detained while the passenger was dead.
Police later identified the passenger as a Polish national.

Security sources cited by DPA news agency said that the man behind the wheel was an asylum seeker from Afghanistan or Pakistan who arrived in Germany in February.

The daily Tagesspiegel said the man was known to police but for minor crimes, not links to terrorism.

German authorities said there was no indication of "further dangerous situations in the city near Breitscheidplatz", where the suspected attack took place.

"We are investigating whether it was a terror attack but do not yet know what was behind it," a police spokesman said.

Chancellor Angela Merkel reacted quickly to the incident, with spokesman Steffen Seibert tweeting: "We mourn the dead and hope that the many people injured can be helped."