Some of the anti-Muslim backlash on social media has been more aggressive than ever. Plus I think they're genuinely concerned that there could be other nutters out there with bombs, including whoever built the last bomb. Seven arrests within the UK now, in Manchester, Wigan and Nuneaton, and the suspect's father and brother have been found in Libya and arrested. I don't think we can apply IRA type logic to terrorists like this. The act of killing and maiming itself, and causing outrage and grief, seems to be the major motivation, rather than causing panic and disruption.