significantly increased. it reads in part "we are aware of recent information suggesting u.s. military bases, locations and events could be targeted in the near term." the bulletin also lists precautions that should be taken that point to so-called insider threats within the military including individuals who act unusual questions about building maintenance or security procedures. suspicious interest in entry points or access controls. queries about air conditioning and ventilation system. u.s. investigators are increasingly overwhelmed by the high levels of messaged traffic, making the hard to know who is spreading the isis message and who is dedicated enough to launch an attack inside this country. >> sometimes it's difficult to know whether or not the threats are actually credible. what do you make of it? >> the bulletin says there are no credible threats at this time. earlier this year even before the heightened chatter, the secretary of homeland security concede sed it's a boiler plate turn that's thrown into virtually every intelligence