home turf. >> has there been one specific threat that led to this announcement? >> we're not looking at one specific threat. we're looking at threats from all corners of the globe. the worry is there will be a lone offender, not necessarily affiliated with isis who will reach out, strike out on his own and cause the kind of damage we saw in canada last week. >> molly hunter, thank you. a friend of dzhokhar tsarnaev has been found guilty of lying. robel phillipos lied about being in tsarnaev's dorm room while two other friends removed potential evidence three days after the bombings. tsarnaev's trial is expected to start in january. it was all over in a matter of seconds. a rocket en route to the international space station blew up just after liftoff. now nasa and the private company that owns the rocket will try to figure out what went wrong. here's abc's josh haskell. >> reporter: just seconds into liftoff, the antares rocket stops heading towards space and explodes. the rocket was on its way to the