the charges for the third suspect, all we know at this point is that the third suspect that was arrested in connection with the boston bombing attack is a u.s. citizen. and we're hearing from one of the students' attorneys, though, that that third suspect was a student at umass dartmouth. 3:30 hearing, here at the federal courthouse today, according to the u.s. attorney's office. brooke? >> okay, pamela brown, stand by there. again, these are federal charges, hence the federal courthouse here in boston. for more on the chronology and details and the ticktock as we see, i want to go to jake tapper who is now in washington for some new details on these developments today. and, jake, you're talking to these two government sources and i want you to specifically talk about this window when according to your sources some of these suspects apparently were contacted by dzhokhar tsarnaev after monday's boston bombings here on boylston street. >> that's right, brooke.