1. A surveillance method comprising: using at least one event sensor disposed in a security area of a surveillance region to sense an occurrence of a potential security breach event; using at least one camera with a view of the security area in which the event is sensed to gather biometric information concerning at least one person in the vicinity of the security area at about the time of the sensing of the event: producing a subject dossier corresponding to the at least one person, the subject dossier including at least two biometric signatures; matching biometric information of one or more persons captured by one or more other cameras in the vicinity of the at least one camera with corresponding biometric information in the subject dossier; and fusing the at least two signatures and including the fused signature in the subject dossier.