http://news.bbc.co.uk/2/hi/europe/2967376.stm An Iraqi man has been arrested in Belgium in connection with a number of letters laced with toxic powders that were sent to the prime minister's office and the US and British embassies.
A 45-year-old man was taken into custody in the western town of Deinze, police said.
The arrest came a day after police said they were investigating 10 letters containing harmful powders.
The chemicals included phenarsazine, an arsenic derivative used in rat poison, and hydrazine, used as a rocket propellant, the health ministry said.
One report said hydrazine had also been used as an incapacitating gas during the two world wars. ...
[Yet another possible use for hydrazine]