Ten months ago, Taimour Abdulwahab set off a bomb in central Stockholm. The image below illustrates the weak signal Violence Propensity Index (VPI) related to Sweden that Gavagai picked up in the Swedish blogosphere between August 1, and December 21, 2010. Note that the suicide bombing in Stockholm is preceded by approximately 30 days of increased volatility and rising VPI levels and a significant spike on the December 8, that is, three days prior to the event.
