They were only detonator blasts, not big ones. So either 1) The bombs were only there to scare people and cause havok but not kill lots of people 2) It was a conincidence that the bombs all didn't go off or 3) The bombs were made by the IRA, who have a long history of bad bombmaking :P
EDIT: Mum just phoned, she's OK and was nowhere near the the places where the bombs went off, phew
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