tonight, several developing stories as we come on the air. the president described as volcanic, seething tonight, as the guessing game now envelops washington. the president demanding to know who wrote the letter published by "the new york times." the president telling the paper to reveal the writer, arguing it's a threat to national security. tonight, right here, the list of denials. the deadly rampage. what we have just learned tonight about the shooter and his arsenal after a gunman walks into an office building at a bank and openis fire. the breaking headline unfolding tonight at the philadelphia airport. two separate flights landing, passengers suddenly complaining of a mysterious illness. the cdc holding the passengers