Initially asked about the incident on Saturday, the FBI said it had joined the U.S. Secret Service and the U.S. Postal Inspection Service i...

She contacted an American poisons dealer and said she needed a “tasteless” and deadly toxin to get her mother “out of the way”.

A letter sent to US President Barack Obama has been tested positive for the deadly poison ricin, federal investigating agencies said today.

There are no loud bangs or messy blood that would draw attention. And if done with patience there might not be a trace of evidence. Here's ...