Swedish police said at least three people were killed and several others were injured when a truck plowed into a crowded shopping center in central Stockholm.

During a press conference, Prime Minister Stefan Lofven stated that police has detained one individual and that all indications point out that the incident was “a terror attack.”

He said, “The government is informed and doing everything to help authorities with it,”

According to Swedish National Broadcaster SVT, the truck attack killed at least five people but the information could not be confirmed by police at that time. Radio reports indicate that at least three people have been killed.

There were separate reports of shots fired in different areas of the Swedish capital which spokeswoman Towe Hagg refused to confirm.

TT News Agency said the truck used in the attack was owned by Swedish brewery Spendrups, and according to the company, it had been hijacked at an earlier time.

Marten Lyth, the brewery’s Director for Communications explained: “It’s one of our distribution vehicles which runs deliveries. During a delivery to the restaurant Caliente someone jumped into the driver’s cabin and drove off with the car, while the driver unloads.”

A witness to the attack told Sky News that the truck came out of nowhere. “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. I saw at least two being run over. I ran as fast as I could from there,” the person described.

Blanket-covered bodies on the scene of terror attack in Stockholm

Jan Granoth, another witness, told Aftonbladet daily: “We stood inside a shoe store and heard something … and then people started to scream. I looked out of the store and saw a big truck.”

According to TT news, a witness said: “I also saw people with blankets over them,” he said. “The whole body was covered.”

A number of people were also seen being loaded into ambulances and rushed off.