after they stole a car. shots were fired. more now. reporter: the french national guard are swarming a town north of paris at this hour where the two suspects from this week s deadly newspaper attack are reportedly holding a hostage inside a business. french officials say a massive operation is underway to detain the suspects. [ gunfire ] reporter: this of the last time the world saw the brothers with assault rifles who french policevey heavily armed and police say are heavily armed and dangerous. they are orphans and want to feel they belong to something and feel the need for revenge. reporter: both brothers aged 32 and 34 were known to counterterrorism officials. both are on the u.s. no-fly list but apparently they were not considered worth tracking. i think france has a problem of too little capacity, you know too many friends. reporter: french officials passed along intelligence to the u.s. that one of the gunmen visited yemen in 2011 and