Reggie: Not to be critical here, but you say you don't have time to call your mother, and yet you seem to spend an awful lot of time on GFY lately.
If you believe a threat is serious, you realize you could simply contact Interpol and they will forward it to the respective member country, right?
http://www.interpol.int/Forms/Contact_INTERPOL
Frankly, if you believe a threat to be serious, I am surprised you would think posting on an adult message board is more productive than reporting it to the authorities.