Police sources told public broadcaster SVT the device was found in a bag, and had not been detonated, adding that the attacker had “burned himself”.
Forensics officers and bomb disposal squads worked through the night at the site of the massacre in Drottningatan, a busy shopping area of the Swedish capital.
The lorry was left partially embedded in the Ahlens department store after being ploughed into pedestrians on Friday afternoon, killing four people and wounding 15 others.
The atrocity sparked panic in the Swedish capital, sending people running for cover as public transport and parliament went into lockdown.
A man arrested in Märsta, north of Stockholm, later on Friday is believed to be the driver of the lorry after being found “behaving suspiciously with minor injuries”.
He has not been formally identified but local media described him as a 39-year-old man from Uzbekistan, who had reportedly expressed support for Isis online.
Sweden’s prosecutor said he has been arrested on suspicion of murder and terror offences, and will appear in court for a pre-trial custody hearing.
A second man believed to be linked to the main suspect was detained in the district of Hjulsta.
The attacker hijacked a lorry belonging to the Swedish brewery Spendrups as it made a delivery at a nearby restaurant, with a masked man climbing into the empty cab.
The firm said the driver did everything he could to stop his vehicle being stolen, standing in front of it before throwing himself to the side when the attacker almost ran him down, Expressen reported.
The lorry was used to ram into people in a pedestrianised street before crashing into Ahlens shortly before 3pm local time (2pm BST).
“I turned around and saw a big truck coming towards me. It swerved from side to side. It didn't look out of control, it was trying to hit people,” said Glen Foran, an Australian tourist.
“It hit people, it was terrible. It hit a pram with a kid in it, demolished it.”
There was no immediate claim of responsibility for the attack, although both Isis and al-Qaeda have recently released propaganda calling on followers to carry out vehicle rammings and containing bomb-making instructions.
Lorries were used by Isis supporters in the attacks in Berlin and Nice last year, while cars were used in Westminster and at Ohio State University.
Isis propaganda has continued attempting to incite terror attacks in Europe, the US, Australia and other countries supporting military operations against its fighters.
Police released CCTV images of a man they wanted to speak to after Friday's attack - Suspect |
An issue of its Rumiyah magazine issued in November advised jihadis to launch vehicle attacks in an article citing the Nice lorry attack that killed 86 people as a “superb demonstration”.
“Having a secondary weapon, such as a gun or a knife, is also a great way to combine a vehicle attack with other forms,” it read.
The group previously claimed responsibility for a firebombing at a centre used by Shia Muslims in the Swedish city of Malmö.
No one was injured in the incident in October, with a 30-year-old Syrian man charged with terror offences after prosecutors found he had affiliated himself with Isis.
The most recent attack in Stockholm was in 2010, when an Iraqi-born Swede killed himself while detonating two bombs days before Christmas.
Independent
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