When he decided to move from Sweden to Britain in 2001, Taimour Abdulwahab al-Abdaly found himself living in a small community that has thrown up more than its fair share of violent jihadists.
Police and security service officers in Sweden and the UK are now attempting to discover how Abdaly came to be radicalised to such an extent that he would attempt to mount a mass-casualty attack in Sweden, the country that became his home when he was 10 years old. They will be particularly anxious to establish whether any individuals living in Luton played a part in the process.
The Swedish foreign minister Carl Bildt last night said Swedish authorities were "co-operating closely" with the UK on the investigation and were making an "intensive" effort to work out if Abdaly was acting alone or with accomplices. "That is obviously something that the authorities are extremely keen to try to find out," he said.