Swedish police released photographs of the man suspected of plowing a truck into a crowd of people before slamming into a department store in Stockholm this morning.
2 p.m. Though local media have reported one arrest, police have said no one is being held.
Friday's truck crash was near the site of a December 2010 attack in Stockholm in which Taimour Abdulwahab, a Swedish citizen who lived in Britain, detonated a suicide bomb, killing himself and injuring two others.
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The incident unfolded in the heart of Stockholm at the Ahlens department store on Drottninggatan - the biggest pedestrian street in the nation's capital - on Friday afternoon. "The United States and Sweden are committed partners in this fight, and we stand ready to offer any assistance Sweden might require in investigating this brutal and senseless attack".
Intensive intelligence work was underway in order to identify the person or persons behind the attack, the spokesman said.
Mr Christoffer Ung was shopping at Ahlens department store at Drottninggatan when the truck struck the building.
Former Gold Coast resident Sabina Allotta, who witnessed the attack unfold from her office window 150 metres away, said it was "surreal".
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"Sweden has been attacked", Prime Minister Stefan Lofven said in a nationally televised press conference.
Last month, Khalid Masood, a 52-year-old convert to Islam known to British security services, drove a auto at high speed into pedestrians on London's Westminster Bridge before launching a frenzied knife attack on a policeman guarding the parliament building.
The Latest on the truck crashing into a department store in central Stockholm.
Another witness quoted by the paper said: "When I came out, I saw a lorry standing there with smoke coming from it and there were loads of bits of cars and broken flower pots along the street". "Heavy weapons, civilian police, etc", he said.
"I heard the noise, I heard the screams, I saw the people", she told BBC News. But the person who was driving the truck is not in police custody, The Local reports. "We took care of everyone lying on the ground", he told Swedish daily newspaper Aftonbladet.
A spokesman for German Chancellor Angela Merkel said: "Our thoughts go out to the people in Stockholm, to the injured, their relatives, rescuers and police. Everything points to a terror attack".
Abdulwahab had rigged a auto with explosives in the hope the blast would drive people to Drottninggatan - the street hit Friday - where he would set off devices strapped to his chest and back.
Prosecutors have given detectives more time to question the suspect in custody, Stockholm police said.
Police said the truck is now in their possession and they are interviewing the original driver of the vehicle. The vehicle bomb never went off, and Abdulwahab died when one of his devices exploded among panicked Christmas shoppers.