Letter containing a "toxic" white powder sent to at least three official buildings in Brussels. envelopes received Thursday at State Security, at the office of the Minister of Justice, and at the courthouse.

Brucine is a violent poison which has properties similar to those of strychnine, the absorption of which causes muscle contracture and leads to respiratory paralysis. Prosecutor assured that "the first results of the investigation showed that these facts have nothing to do with the shootings of recent days in Brussels"