Deep breath, Selene.
Everyone's opinion is valuable here.
FBI Investigates Letter Threatening Honolulu Airport
Authorities Say No Security Added
HONOLULU -- FBI offices in five cities, including Honolulu, are investigating a threatening letter that they hope is a hoax.
Authorities aren't ready to call the letter a hoax, but they are also not responding with any additional security.
The main feature of the letter is apparently a caricature of the mythological grim reaper and some other symbols. It was sent from the United Kingdom to airports in Honolulu, San Francisco, Los Angeles, New York and Baltimore.
The apparently identical letters reportedly say, "Your days are numbered." (snip)
http://www.thehawaiichannel.com/news/3671144/detail.html