Oh boy.
This was just discussed a few pages ago.
One of Zawahiri's plans was cyanide sprayed from perfume bottles to attack the London Tube.
Remember the 7-7 bombers large purchase of expensive perfume. I have heard they shave themselves and use rose water scent prior to homicide bombing but not Jean Paul Gaultier, Fahrenheit, Emporio Armani and Boss.
Jermaine Lindsay also bought Acetone Peroxide - also known as TATP or "Mother of Satan" - which was used in the London bombs.