Sweden suicide bombing: chilling threats of UK-based terrorist
The Stockholm bomber sent a chilling audio recording in English shortly before two bombs went off warning his actions would "speak for themselves".
A man is heard describing the Islamic state as a "reality" in Europe and in Sweden.
The voice is thought to be of Taimur Abdulwahab al-Abdaly, a British university graduate who until recently was living in Luton.
He spoke hurriedly but calmly and quietly and cleared his voice several times during the message that lasted less than a minute.
The recording states: "Now the Islamic state has been created. We now exist here in Europe and in Sweden. We are a reality. I don't want to say more about this. Our actions will speak for themselves."
He added: "We are not a lie, or imagination. We are real."
He also referred to the depiction of the prophet Mohammed with the body of a dog in a 2007 cartoon by a Swedish artist which enraged many Muslims.
He said: "Stop your drawings of our prophet...No more oppression against Islam or Muslims will be tolerated in any way or by any means."
Abdulwahab tried to set fire to a car bomb packed with gas canisters in a busy shopping street in the Swedish capital on Saturday. The car caught fire and the bomber fled the scene before blowing himself up 15 minutes later, injuring two bystanders.
He was due to turn 29 on Sunday and had a wife and three young children who still live in Luton. Neighbours said they had seen him in the town as little as two and a half weeks ago.
The former physical therapy student attended Bedfordshire University in Luton. He was born in Iraq and moved with his family to Sweden at the age of 11.
Until now the Scandinavian country has never experienced a suicide bombing and has not had a terrorist attack since the 1970s.
Prime Minister Fredrik Reinfeldt said the attack was "unacceptable".
He said: "Sweden is an open society... which has stated a wish that people should be able to have different backgrounds, believe in different gods... and live side by side in our open society."
MI5 is now investigating possible links with extremists in Luton, whether the bomber was radicalised at the university and claims that he was helped by an extremist group in Yemen, the base for al-Queda in the Arabian peninsula.
Abdulwahab's Facebook page includes a group called Yawm al-Qiyaamah, meaning Day of Judgement, which featured a montage of Tower Bridge in flames.
It was also disclosed that he joined a Muslim dating site looking for a second wife. He described himself as a Sunni Muslim looking for a "strong believer" striving for "jannah" - paradise.