Key points from that report:
Swedish media also reported that a suicide bomber blew himself up about 200 metres from the car. The man apparently had canisters on him and shouted in Arabic before the blast.
Swedish media were also reportedly sent a threatening email before the blast, criticizing the role of Swedish soldiers in Afghanistan and urging Muslims to take action.
Thanks for the update. My statement was one of conjecture not fact. This clears things up.