From Mashable:
A former vendor on the now-defunct online black market bazaar known as Silk Road sent a letter laced with the poison Ricin to U.S. President Barack Obama, according to a letter submitted by an official at the Department of Homeland Security. Brian de Vallance, the acting assistant secretary for legislative affairs for DHS, briefly mentioned the poisoning attempt in a letter he sent the U.S. Senate Committee on Homeland Security and Governmental Affairs.
