New details from the year-long investigation showed a series of technical glitches prevented Taimour Abdulwahab from inflicting mass casualties in one of the Swedish capital’s busiest commercial areas.
The Iraqi-born Swede managed to kill only himself in the attack on 11 December.
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Hide AdAnders Thornberg, deputy head of Sweden’s security service, said only some of the explosives Abudlwahab had been wearing detonated, apparently because of a problem with the trigger.
An unexploded bomb was found in the burned-out wreck of the car he had set on fire about 250 metres from the bomb site. It was hooked up to a walkie-talkie that the suicide bomber was carrying, but the remote-control mechanism failed.
Prosecutor Agnetha Hilding-Qvarnstrom said Abdulwahab might have intended to set off the car bomb as emergency crews arrived to put out the fire, and was perhaps trying to fix a problem with the explosives when they went off.