Earlier on Friday, a truck drove into a crowd on a busy shopping street before crashing into a department store in central Stockholm, killing at least four people and wounding many others in what Swedish officials said was likely a terrorist attack.
The explosives, in the form of a homemade bomb, did not properly detonate, SVT reported, citing multiple police sources.
The suspect in a truck-ramming attack in Stockholm, Sweden on Saturday, had reportedly hijacked a beer truck several blocks earlier.
The attack occurred just before 3pm (1300 GMT) when the stolen truck slammed into the corner of the bustling Ahlens store and the popular pedestrian street Drottninggatan, above ground from Stockholm's central subway station.
"Police received a call from SOS Alarm that a person in a vehicle has injured other people on Drottninggatan", police wrote on Twitter.
Pictures taken at the scene showed a large blue beer truck with a mangled undercarriage smashed into the Ahlens department store.
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People in the downtown area are fleeing the scene in panic.
Eight victims, including children, remain in hospital, according to Swedish media.
Sweden's King Carl XVI Gustaf says the number of people willing to help after the deadly truck attack in Stockholm is "many, many more than those who wish us harm".
Iranian Foreign Ministry spokesman Bahram Qassemi condemned the terrorist truck attack in Stockholm which resulted in killing and injuring some innocent people, said the website of the Iranian Ministry of Foreign Affairs. "It was awful to see", said the man, who saw the incident from his vehicle.
Swedish police said it was especially hard to identify "lone wolf" attackers in an open, Nordic society.
It didn't look out of control, it was trying to hit people, ' Glen Foran, an Australian tourist in his 40s, told Reuters after Friday's attack.
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Friday's attack was the latest in a string of assaults with vehicles in Europe.
The deadliest came a year ago in France on the Bastille Day national holiday when a man rammed a truck into a crowd in the Mediterranean resort of Nice, killing 86 people.
In response, hundreds gathered Saturday at the site of the crash in the Swedish capital, building a heartbreaking wall of flowers on the aluminum fence put up to keep them away from the site's broken glass and twisted metal.
Swedish media reports that up to five people have been killed, and that shots also were fired in the area.
The bloodshed also bore hallmarks to attacks seen in Nice and Berlin a year ago.
Flags flew at half-mast across Stockholm on Saturday as the city slowly returned to normal a day after the attack.
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