MAGDEBURG, Germany — A 9-year-old was among five people killed when a Saudi doctor drove into a Christmas market teeming with holiday shoppers in the German city of Magdeburg, an official said Saturday, as people mourned the victims and their shaken sense of security.

City official Ronni Krug said he didn’t have further information on the adults who were killed on Friday night. He said 200 people were injured, of whom 41 in serious or very serious condition.

Prosecutor Horst Nopens said the suspect, a 50-year-old Saudi doctor, is under investigation on suspicion of murder, attempted murder and bodily harm. He is currently being questioned. He has lived in Germany since 2006, practicing medicine in Bernburg, about 40 kilometers (25 miles) south of Magdeburg, officials said.

“There is no more peaceful and cheerful place than a Christmas market,” Chancellor Olaf Scholz said. “What a terrible act it is to injure and kill so many people there with such brutality.”

Neurosurgeon Mahmoud Elenbaby said some 80 patients were brought to Magdeburg’s university hospital on Friday night.

“We managed to stabilize most of them, but many are still in intensive care, and some are also in critical condition,” Elenbaby told The Associated Press as he dashed into the hospital cafeteria to buy himself a cola.

Several German media outlets identified the suspect as Taleb A., withholding his last name in line with privacy laws, and reported that he was a specialist in psychiatry and psychotherapy.

Mourners lit candles and placed flowers outside a church near the market on the cold and gloomy day. Several people stopped and cried. A Berlin church choir whose members witnessed a previous Christmas market attack in 2016 sang Amazing Grace, a hymn about God’s mercy, offering their prayers and solidarity with the victims.

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The Man Behind the Attack

There were still no answers Saturday as to what motivated the man to drive his black BMW into a crowd in the eastern German city.

Describing himself as a former Muslim, the suspect shared dozens of tweets and retweets daily focusing on anti-Islam themes, criticizing the religion and congratulating Muslims who left the faith.

He also accused German authorities of failing to do enough to combat what he said was the “Islamism of Europe.”

Nopens, the prosecutor, said the motive may have been “dissatisfaction with the treatment of Saudi refugees in Germany” but investigators are still trying to get to the bottom of what was behind the attack.

“He has at least talked about the motive,” Nopens said. “And we have to clear up how much of that is true.”

Investigators have to analyze computers, mobile devices and other evidence, “and at the end of the day we will know, or at least hope to know, what drove him to this act.”

“We have talked about an attack,” he said. “Whether it was a terror attack, we don’t know yet.”

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Magdeburg Is Shaken

The violence shocked Germany and the city, bringing its mayor to the verge of tears and marring a festive event that’s part of a centuries-old German tradition. It prompted several other German towns to cancel their weekend Christmas markets as a precaution and out of solidarity with Magdeburg’s loss. Berlin kept its markets open but has increased its police presence at them.

Germany has suffered a string of extremist attacks in recent years, including a knife attack that killed three people and wounded eight at a festival in the western city of Solingen in August.

Those attacks have led cities to beef up security at Christmas markets and other events.

On Friday the suspect used a special escape and rescue route to enter the market, according to Tom-Oliver Langhans, director of the Magdeburg police.

Magdeburg is a city of about 240,000 people, west of Berlin, that serves as Saxony-Anhalt’s capital. Friday’s attack came eight years after an Islamic extremist drove a truck into a crowded Christmas market in Berlin, killing 13 people and injuring many others. The attacker was killed days later in a shootout in Italy.

Chancellor Scholz and Interior Minister Nancy Faeser traveled to Magdeburg on Saturday, and a memorial service is to take place in the city cathedral in the evening. Faeser ordered flags lowered to half-staff at federal buildings across the country.

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A Recount of the Horrifying Attack

Verified bystander footage distributed by the German news agency dpa showed the suspect’s arrest at a tram stop in the middle of the road. A nearby police officer pointing a handgun at the man shouted at him as he lay prone, his head arched up slightly. Other officers swarmed around the suspect and took him into custody.

Thi Linh Chi Nguyen, a 34-year-old manicurist from Vietnam whose salon is located in a mall across from the Christmas market, was on the phone during a break when she heard loud bangs and thought at first they were fireworks. She then saw a car drive through the market at high speed. People screamed and a child was thrown into the air by the car.

Shaking as she described the horror of what she witnessed, she recalled seeing the car bursting out of the market and turning right onto Ernst-Reuter-Allee street and then coming to a standstill at the tram stop where the suspect was arrested.

The number of injured people was overwhelming.

“My husband and I helped them for two hours. He ran back home and grabbed as many blankets as he could find because they didn’t have enough to cover the injured people. And it was so cold,” she said.

The market itself was still cordoned off Saturday with red-and-white tape and police vans every 50 meters (yards). Police with machine pistols guarded every entry to the market. Some thermal security blankets still lay on the street.

Christmas markets are a German holiday tradition cherished since the Middle Ages, now successfully exported to much of the Western world.