A truck as has driven into a crowd at a shopping center in central Stockholm, killing at least two people and injuring several, Swedish police said.

Swedish radio said Friday that three people have been killed in the crash and Swedish broadcaster SVT said shots have been fired.

Police confirmed that a lorry ran over a crowd at Ahlens city (department store) and that people were injured. Spokeswoman Towe Hagg would not confirm the deaths or reports of shots fired.

"There are injured people but we have no further details on the extent of their injuries and the number of people injured," police said in a statement on its website.

It is unknown at this time if the event was a terrorist attack.

People in the area are fleeing the scene.

People look on at the scene after a truck crashed into a department store injuring several people in central Stockholm, Sweden, Friday April 7, 2017. (Andreas Schyman, TT News Agency via AP)

A witness said the truck came out of nowhere, Sky News reported.

“I went to the main street when a big truck came out of nowhere. I could not see if anyone was driving it but it got out of control,” the person said. “I saw at least two being run over. I ran as fast as I could from there".

The Swedish news agency TT said several people have been rushed away in ambulances, and live television footage showed smoke coming out of the department store that the truck smashed into

A witness told TT news agency: “I also saw people with blankets over them," he said. "The whole body was covered."

Europe has reeled from a string of terror attacks involving drivers ramming trucks into populated areas. In July 2016, a truck plowed into a crowd at a waterfront promenade in the French tourist hotspot of Nice, killing 86 people. Police killed the driver, Mohamed Lahouiaej Bouhlel. The Islamic State terror group claimed responsibility.

Just over two weeks ago in London, a driver linked to radical Islam crashed his rented SUV into a crowd on Westminster Bridge before attacking an officer on the grounds of Parliament. A fifth victim of his rampage died Friday: a Romanian woman who fell into the river below. Dozens of other people were wounded. The killer, Khalid Masood, was shot dead at Parliament.