REPUBLIKA.CO.ID, STOCKHOLM -- Swedish police are increasingly confident they have caught the man responsible for a truck attack in the capital Stockholm on Friday, but would not rule out the possibility that other people had been involved.

The attack sent terrified shoppers running for their lives as the stolen truck rammed pedestrians and crashed into a department store, killing four people and injuring 15 others.

Swedish prosecutor Hans Ihrman confirmed the suspect was a 39-year-old Uzbekistan-born man. The prosecutor also said he had not yet spoken, and could not confirm whether he was a legal resident of Sweden.

"Nothing points to that we have the wrong person, on the contrary, suspicions have strengthened as the investigation has progressed," the head of the national police, Dan Eliasson, told reporters.

"We still cannot rule out that more people are involved."

The head of Sweden's domestic intelligence agency said the man had been on authorities' radar some time ago, and had figured in intelligence material.

"We received intelligence last year, but we did not see any links to extremist circles," said Anders Thornberg, head of the Swedish Security Service.

"The arrested man was not part of any of the security police's ongoing investigations. However, he is a person who has previously figured in our intelligence flow."

Thornberg said the security services were working with other nations' security agencies on the matter, but declined to elaborate.

Eliasson said police also found an object on the driver's seat of the truck that "could be a bomb or an incendiary object, we are still investigating it".

"We have found something in the truck, in the driver's seat, a technical device that should not be there," he said.

"I cannot say at this stage that this is a bomb or some sort of flammable material.

"Whether it is a classic bomb or a fire device or something else is subject to technical analysis."

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