CANADA : Mysterious Powder Alarms Revenue Canada Workers

[CBC News] CANADA : Mysterious powder alarms Revenue Canada workers"Four Revenue Canada workers in Winnipeg were sent to hospital Monday after coming into contact with a mysterious powdered substance Monday. The powder spilled from an envelope when it went through one of the tax centre's sorting machines""The four workers went through a decontamination process at the centre and appeared to be all right, but were later sent to hospital as an extra precaution, he said. Another two dozen other employees were placed in quarantine after the incident and then sent home"http://www.cbc.ca/canada/manitoba/story/2008/03/31/revenue:powder.html