Trump on Berlin attack: "It's an attack on humanity, is what it is, its an attack on humanity and it’s got to be stopped."— Ben Siegel (@benyc) December 21, 2016
UPDATE 2:05 p.m. EST: Donald Trump called the Berlin incident an "attack on humanity."
UPDATE 1:49 p.m. EST: Peaceful protests are underway outside Chancellor Angela Merkel's office. Protests are led by Alternative for Germany, a conservative group. Signs read "On Merkel's hands is the blood of her people."
UPDATE 12:02 p.m. EST:
Police identified the suspected driver of the truck that slammed into a crowd of shoppers as Tunisian-born Anis Amri, 24.
A 100,000-euro (U.S. $104,439) reward was offered for information leading to his arrest.
UPDATE 10:22 a.m. EST:
CNN reports the new suspect in the Berlin market attack was arrested in August with forged documents but was released.
German police raided a residence in the Westphalia region where the suspect had previously stayed, but have not yet made any arrests.
UPDATE 9:14 a.m. EST:
The new suspect in the Berlin market attack has ties to Islamic extremists, German lawmaker Stephan Mayer said. The suspect was meant to be deported from Germany earlier this year.
Germany's government has drafted a bill that will make it easier to allow video surveillance in public places, but the bill needs to be approved by Parliament before taking effect.
Germany has historically been very reluctant to conduct mass surveillance.
The manhunt for the driver who killed 12 people and injured dozens by plowing a truck through a crowded Christmas market on Monday has a new focus.
Police are searching for a Tunisian man after his ID was found in the truck used in the attack, CNN reports.
Police arrested a suspect shortly after the attack, but released him after finding there was no evidence he was involved. Since asking for the public's help, police said they were investigating more than 500 leads.
The person who carried out the truck run over attack in Berlin is a soldier of the Islamic State ...
ISIS claimed responsibility for the attack on Tuesday, saying the driver answered a call for terror attacks in the West. However, a specific link tying the driver to ISIS has not been found yet, police said.
Local media originally and incorrectly identified "Naved B," a Pakistani refugee, as the driver.
French President Francois Hollande said French intelligence services are in "constant contact" with German counterparts. Earlier this year, a truck driver in the southern France city of Nice killed 86 before he was shot and killed.
Here's the scene of the devastation after the attack and the resulting memorials.
The Associated Press contributed to this report.