of course we are live in boston to catch you up on the latest on the boston marathon bombing investigation and perhaps the only person who knows the motive for this attack is sedated with a tube running down his throat this morning. dzhokhar tsarnaev, he s under heavy guard right now at a boston hospital. officials say the 19-year-old will face federal terrorism charges and possibly state murder charges. investigators now also think he and his older brother acted alone. and the fbi says its agents interviewed that brother back in 2011 but didn t find any ties to terrorism at the time. even so the contact reportedly was enough to deny tamerlan tsarnaev american citizenship. for one muslim american his first thought after the bombings was please, god, don t let the bomber be muslim. now we know that they are. remember, the fbi says there is no clear motive for the bombings. and there s no connection as now as far as we know to any jihadist group, although