Police said Tuesday that the driver who rammed a truck into a crowded Christmas market in the heart of the German capital, killing at least 12 people and injuring nearly 50, did so intentionally and that they are investigating a suspected "terror attack."
The truck struck the popular Christmas market outside the Kaiser Wilhelm Memorial Church late Monday as tourists and locals were enjoying a traditional pre-Christmas evening near Berlin's Zoo station.
"Our investigators are working on the assumption that the truck was intentionally driven into the crowd at the Christmas market on Breitscheidplatz," Berlin police said on Twitter.
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"All police measures concerning the suspected terror attack at Breitscheidplatz are being taken with great speed and the necessary care," they said.
Hours earlier Germany's top security official had refrained from pointing to an intentional act, but said evidence pointed in that direction, while the White House condemned "what appears to have been a terrorist attack."
The crash came less than a month after the U.S. State Department called for caution in markets and other public places across Europe, saying extremist groups including Islamic State and al-Qaida were focusing "on the upcoming holiday season and associated events."
The Islamic State group and al-Qaida have both called on followers to use trucks in particular to attack crowds. On July 14, a truck plowed into Bastille Day revelers in the southern French city of Nice, killing 86 people. Islamic State claimed responsibility for that attack, which was carried out by a Tunisian living in France.
After the Berlin attack, dozens of ambulances lined the streets waiting to evacuate people, and heavily armed police patrolled. Authorities on Twitter urged people to stay away from the area, to keep the streets clear for rescue vehicles.
Among the dead was a man in the truck, who succumbed as paramedics treated him, Berlin police spokesman Winfried Wenzel said. Police said later that the man was a Polish national, but didn't give further details of who he was or what happened to him.
A suspect believed to be the driver was picked up about 2 kilometers (1½ miles) away, near the Victory Column monument.
Berlin's public radio station RBB-Inforadio reported that the suspect was a Pakistani citizen who entered Germany on Dec. 31, 2015. RBB-Inforadio cited unnamed security sources in its report, which concurred with those in other German media. Berlin police declined to confirm the reports, but Wenzel said the man was being interrogated.
The truck was registered in Poland.
The Polish owner of the truck said he feared the vehicle may have been hijacked. Ariel Zurawski said he last spoke with the driver, his cousin, around noon, and the driver told him he was in Berlin and scheduled to unload Tuesday morning. "They must have done something to my driver," he told TVN24.
Federal prosecutors, who handle terrorism cases, took over the investigation, according to German Justice Minister Heiko Maas. In Washington, White House National Security Council spokesman Ned Price said the United States was in contact with German officials and ready to help in the investigation and response.
U.S. President-elect Donald Trump blamed Islamist terrorists, though it was unclear what that assessment was based on. He said Islamic extremists must be "eradicated from the face of the earth" and pledged to carry out that mission with all "freedom-loving partners."
But German officials said shortly after the attack that it was too early to call the crash intentional.
"I don't want to use the word 'attack' yet at the moment, although a lot speaks for it," Interior Minister Thomas de Maiziere told ARD television. "There is a psychological effect in the whole country of the choice of words here, and we want to be very, very cautious and operate close to the actual investigation results, not with speculation."
Germany has not experienced any mass-casualty attacks by Islamic extremists, but has been increasingly wary since two attacks by asylum-seekers in the summer that were claimed by the Islamic State group. Five people were wounded in an ax rampage on a train near Wuerzburg and 15 in a bombing outside a bar in Ansbach, both in the southern state of Bavaria. Both attackers were killed.
Those attacks, and two others unrelated to Islamic extremism in the same weeklong period, helped stoke tensions in Germany over the arrival last year of 890,000 migrants.