could be a local support group for isis that carried this out in tunisia. there's a very large pro-jihadi movement in tunisia called ansar al sharia. they also carried out an attack on the u.s. embassy in tunis just a few days after the attack in 2012 and there is also a very active north african al qaeda affiliate based in tunisia in the mountainous region near the algerian border. late last year they said they were going to bring jihad to tunis. >> what do we know about the individuals who carried out this attack? we heard that one of them was known to tunisian authorities. are there other terror suspects they are still searching for? >> we know very little about the individuals so far beyond the fact that one of them was on the radar screen of tunisian security services.