fox news asked the fbi to comment on the status of the bomb analysis but there was no immediate response, bill. bill: catherine, thank you from washington. you are welcome. to our viewers at home we had expected an fbi briefing. that was postponed. their words from earlier tonight. it still may happen this evening. if it does during this broadcast, we will certainly bring that to you live. also, a major story breaking earlier today and throughout the day. the fbi telling fox there is no sign of any connection between the bombings here in boston and those suspicious letters turning up in washington. investigators say early tests on letters sent to president obama and mississippi republican senator roger wicker were positive for ricin. that s a deadly poison. 6,000 times more poisonous, they say, than many other items e% say preliminary tests can be wrong and they re waiting for final results. officials say they intercepted both letters before they got to the white house or the c