In September, a mysterious, powerful explosion shook-up a vast Soviet-era virology campus in Siberia called VECTOR. Filippa Lentzos writes that around the world, people in the know sat up and took notice, and for a good reason. Was the explosion the result of a deliberate attack by terrorists who were trying to gain a hold of deadly cultures to be used in bioterror attacks? Or was it an accident which, as was the case with an explosion at a similar facility forty years ago, would expose illicit bioweapons activities by Russia?