Firefighters inspect the site after a truck ran into a crowded Christmas market and killed several people in Berlin, Germany, Monday, Dec. 19, 2016. (Michael Sohn/AP)
Forensic experts of the police investigate the crime scene after a truck ran into a crowded Christmas market and killed several people in Berlin, Germany, Monday, Dec. 19, 2016. (Michael Sohn/AP)
Firefighters look at a toppled Christmas tree after a truck ran into a crowded Christmas market and killed several people in Berlin, Germany, Monday, Dec. 19, 2016. (Michael Sohn/AP)
Firefighters load an injured person into an ambulance after a truck ran into a crowded Christmas market and killed several people in Berlin, Germany, Monday, Dec. 19, 2016. (Michael Sohn/AP)
Firefighters stand beside a truck that ran into crowded Christmas market and killed several people in Berlin, Germany, Monday, Dec. 19, 2016. (Michael Sohn/AP)
Police guard a Christmas market after a truck ran into a crowded Christmas market and killed several people in Berlin, Germany, Monday, Dec. 19, 2016. (Markus Schreiber/AP)
Firefighters walk past ambulances after a truck ran into a crowded Christmas market and killed several people in Berlin, Germany, Monday, Dec. 19, 2016. (Michael Sohn/AP)
Ambulances arrive after a truck ran into a crowded Christmas market and killed several people in Berlin, Germany, Monday, Dec. 19, 2016. (Michael Sohn/AP)
From Instagram: "Truck came barreling through the christmas market. if i hadn't stopped to check my phone, i would have been hit. everyone went scurrying. so many people hurt." (missadvnture)
A police officer with a submachine gun stands guard after a truck ran into a crowded Christmas market in Berlin, Germany, Monday, Dec. 19, 2016. (Markus Schreiber/AP)
Firefighters walk past a truck which ran into a crowded Christmas market in Berlin, Germany, Monday, Dec. 19, 2016. (Michael Sohn/AP)
Police stand beside a damaged truck which ran into crowded Christmas market in Berliin Berlin, Germany, Monday, Dec. 19, 2016. (Michael Sohn/AP)
Police stand beside a damaged truck which ran into crowded Christmas market in Berliin Berlin, Germany, Monday, Dec. 19, 2016. (Michael Sohn/AP)
Police stand beside a damaged truck which ran into crowded Christmas market in Berlin, Germany, Monday, Dec. 19, 2016. (Michael Sohn/AP)
At least nine people were killed and several injured when a truck drove into a Christmas market in a public square in Berlin.