German police are investigating a “probable terrorist attack” after a man ploughed a lorry into a Christmas market in the heart of Berlin, killing 12 people and injuring 48.
The driver, reportedly a Pakistani asylum seeker who entered Germany last year, is being questioned.
German media say police are searching a refugee shelter at a Berlin airport where he was believed to be staying.
He was reportedly known to police for minor crimes, but not terror links.
Politicians had avoided branding the bloodshed a terror attack in the hours immediately following, but Interior Minister Thomas de Maiziere told ARD television, “there are many things pointing to one”.
The market is at Breitscheidplatz, close to the Kurfuerstendamm, the main shopping street in Berlin’s west.
The crash happened in the shadow of the Kaiser Wilhelm Memorial Church, which was damaged in a World War Two bombing raid and preserved as a symbol of peace.
The truck, which was loaded with steel beams, veered into the market at 20:14 local time (19:14 GMT), one of its busiest times. It crashed through wooden huts and stands packed with tourists and locals.
The DPA news agency said police believe the lorry drove 50-80 metres (160-260 ft) through the market area.
German media have identified the suspect, citing security sources, as a 23-year-old Pakistani named Naved B.
Reports said special forces had stormed a hangar at Berlin’s Tempelhof airport where they believed the suspect had been living in a shelter before the attack.
Police spokesman Winfried Wenzel said the suspect was seized after leaving the lorry and fleeing on foot for more than a mile (2km) towards the Tiergarten, a large public park.
A witness who followed him called the police, who quickly detained the suspect near the Victory Column monument.
Police said a Polish man, believed to be the original driver, had been found dead on the passenger seat.
Ariel Zurawski, the Polish owner of the lorry, confirmed that his driver was missing and had been unreachable since 16:00 (15:00 GMT) on Monday.
“We don’t know what happened to him,” he told the AFP news agency. “He’s my cousin, I’ve known him since I was a kid. I can vouch for him.”
The truck was registered in Poland, but it is unclear whether it was travelling from Poland or returning from Italy, as some reports suggest.
Chancellor Angela Merkel has been briefed by 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.
The former mayor of Nice, Christian Estrosi, tweeted: “Horror in Berlin. Support for the mayor of Berlin and the German people. never again.”
A senior member of Germany’s anti-immigration AfD party, Marcus Pretzell, blamed Chancellor Merkel for the attack, linking it to her open-door migration policy which saw the arrival of more than one million people last year.
A British eyewitness, Mike Fox, told Associated Press that the 25-tonne lorry had missed him by only about three metres as it smashed through stands and knocked down a large Christmas tree.
“It was definitely deliberate,” said the tourist.
He said he had helped people who appeared to have broken limbs, and that others were trapped under Christmas stands.
Australian Trisha O’Neill told the Australian Broadcasting Corporation she witnessed “blood and bodies everywhere”.
“I just saw this huge black truck speeding through the markets crushing so many people and then all the lights went out and everything was destroyed.
“I could hear screaming and then we all froze. Then suddenly people started to move and lift all the wreckage off people, trying to help whoever was there.”
A series of small-scale attacks by Islamist militants alarmed Germany earlier this year. Ten people were killed and dozens more injured in separate gun, bomb, axe and machete attacks in Bavaria and Baden-Wuerttemberg in July.
But Monday’s incident was reminiscent of the lorry attack on Bastille Day crowds in the French city of Nice on 14 July, when 86 people were killed. That attack was claimed by so-called Islamic State (IS).
Both IS and al-Qaeda have urged their followers to use trucks as a means to attack crowds.
The US labelled the tragedy an apparent “terrorist attack” and pledged its support.
President-elect Donald Trump blamed “Islamist terrorists” for a “slaughter” of Christians in the German capital.
“Today there were terror attacks in Turkey, Switzerland and Germany – and it is only getting worse. The civilized world must change thinking!” he tweeted.
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