Footage has emerged showing the lorry used in the Stockholm terror attack hurtling down a pedestrianised street as shoppers run for cover.
In the CCTV video, people are seen rushing into a store as they scramble to safety to escape the speeding truck in the Swedish capital.
The footage, published by the Expressen newspaper, was believed to have been filmed from inside a ladies clothes shop.
At least four people were killed and 15 others injured when the beer lorry was hijacked and then driven through a crowd on Friday.
The vehicle ended up crashing into a department store.
Police have said a man suspected of carrying out the attack was known to security services.
Officers released a photo of a suspect in the hours after Friday's attack and on Saturday they confirmed a 39-year-old man from Uzbekistan who "matches the description" had been detained over a "terrorist crime".
Anders Thornberg, head of the Swedish security agency, said the suspect "has appeared in our intelligence gathering in the past".
Swedish police chief Dan Eliasson described him as a "marginal character" and confirmed officers had found a suspect device in the truck.
Sky sources say the device was a homemade bomb and Swedish media reports that the attacker "burned" himself while trying and failing to detonate the device.
Mr Eliasson said: "A technical examination is ongoing, we can't go into what it is right now... whether it's a bomb or a flammable device."
According to Sky sources, the suspect was detained after police were notified of a man who was confused and acting strangely.
He was arrested in the suburb of Marsta, not far from the capital's Arlanda airport.
Security at Swedish borders has been tightened and flags are being flown at half mast in a mark of respect to victims.
At the scene of the attack, dozens of people gathered to pay their respects and leave flowers, including Crown Princess Victoria who wiped away a tear.