An articulated lorry has ploughed into a busy Christmas market in the heart of Berlin, killing nine people and injuring many more, police say.
Police say they suspect it was deliberate. Video shows stalls knocked over and people lying injured.
A suspicious person was arrested nearby, while what police describe as a passenger was found dead, police say.
The market is at Breitscheidplatz, close to the Kurfuerstendamm, the main shopping street in the city's west.
Chancellor Angela Merkel has been in contact with the interior minister and the mayor of Berlin, her spokesman, Steffen Seibert, tweeted.
"We are in mourning for the dead and hope that the many injured can get help," he added.
German President Joachim Gauck said in a statement that it was an "awful evening for Berlin and for our country".
Terror attack?
According to the DPA news agency, police believe the lorry drove 50-80 metres (54-87 yards) through the market area during the incident, which occurred at 20:14 local time (19:14 GMT).
"We are investigating whether it was a terror attack but do not yet know what was behind it," a police spokesman told AFP news agency.
"One person was detained. The cab of the truck was found empty."
Police say they suspect it was deliberate. Video shows stalls knocked over and people lying injured.
A suspicious person was arrested nearby, while what police describe as a passenger was found dead, police say.
The market is at Breitscheidplatz, close to the Kurfuerstendamm, the main shopping street in the city's west.
Chancellor Angela Merkel has been in contact with the interior minister and the mayor of Berlin, her spokesman, Steffen Seibert, tweeted.
"We are in mourning for the dead and hope that the many injured can get help," he added.
German President Joachim Gauck said in a statement that it was an "awful evening for Berlin and for our country".
Terror attack?
According to the DPA news agency, police believe the lorry drove 50-80 metres (54-87 yards) through the market area during the incident, which occurred at 20:14 local time (19:14 GMT).
"We are investigating whether it was a terror attack but do not yet know what was behind it," a police spokesman told AFP news agency.
"One person was detained. The cab of the truck was found empty."
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