The British man who was killed in the Sweden lorry attack has been named as 41-year-old Chris Bevington.
Two Swedes and a Belgian national were also killed when a hijacked lorry ploughed into pedestrians in Stockholm on Friday.
Rakhmat Akilov, a 39-year-old man from Uzbekistan, has been arrested on suspicion of "terrorist crimes through murder".
Dozens of people were caught on camera fleeing the scene after a truck drove down a pedestrian street in Stockholm.
Another video, also filmed by engineer Johnny Chadda, shows armed police moving towards the scene.
One eyewitness, described seeing people running "like ants" from the scene.
Mikael Anttila, a 49-year-old portfolio manager at bank SEB, just 100 metres from Ahlens department store where the crash happened, said he saw several hundred people gathered on the street close to the shop, before they all started running "suddenly ... like ants".
"Then a lot of police started coming. Heavy weapons, civilian police, etcetera," he added.
The main suspect in the Stockholm lorry attack has admitted to carrying out a terror crime, his defence lawyer said.
The Ahlens department store in Stockholm apologised "for a bad decision" in promoting the offer.
The British man who was killed in the Stockholm lorry attack has been named as Chris Bevington.