A manhunt is underway for the driver of a large beer truck that plowed into a department store in central Stockholm on Friday, killing at least three and injuring many.

Stockholm police denied previous reports that a man had been arrested at the scene, saying that the driver had not been found.

“We have no contact with the person or persons who drove the truck,” Sweden’s top police chief, Dan Eliasson, told a news conference.

Sky News reported that police believed the man had run away towards the subway station. All subway traffic has been halted.

Police would not confirm how many people many people had been killed or injured. Local media reports varied from two people up to five.

People in the downtown area fled in panic, and Stockholm’s Central Station for trains and the subway, which is a few hundred yards from the scene, was evacuated.

“Sweden has been attacked. Everything points to the fact that this is a terrorist attack,” Prime Minister Stefan Lofven told reporters during a visit in western Sweden.

In a statement Friday, they said that they cannot exclude this is an act of terror based on other events in Europe.

The attack in Sweden would be the latest in a string of deadly high-profile Europe attacks involving powerful vehicles over the past several months.

No terror group has come forward to claim responsibility, but the incident comes on the heels of a similar type of attack in London last month. Khalid Masood drove an SUV into a crowd on Westminster Bridg before he stabbed a police officer. Five people were killed and dozens more were injured by Masood, who was shot and killed that day by police.