Taimur Abdulwahab al-Abdaly tried to set off a car bomb packed with gas canisters in a busy shopping street in Stockholm. The car caught fire and the bomber fled the scene before blowing himself up 300yd away 15 minutes later, injuring two bystanders.

It emerged last night that Abdulwahab, who was due to turn 29 yesterday, is a former physical therapy student at Bedfordshire University in Luton, and that his wife and three young children still live in the town.

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-Qaeda in the Arabian Peninsula.

The suicide bombing follows an attempt by Umar Farouq Abdulmutallab, a former student at University College London, to blow himself up last Christmas on a flight to Detroit...