robert guaderrama, fox19 now. people around the country are now voicing concerns about security at airports, following the attacks. dan dblbx our sara celi is live at c-v-g with details on how officials are stepping up safety measures. washington ap - homeland security secretary jeh jay johnson says there is no "specific, credible intelligence" of any plots against the united states like those carried out in brussels. as a precaution, the homeland security department is stepping up security at major u.s. airports and rail and transit stations around the country. johnson says dhs officials are in contact with their european counterparts and monitoring the ongoing situation. security officials are also reviewing whether additional screening may be necessary for air travelers coming from belgium. belgium is one of 38 countries whose citizens generally do not need a visa to visit the u.s. a lexington, a lexington, kentucky family is on edge... still unable to reach loved ones this morning.... who were at the brussels airport around the time of the attack. stephanie shults graduated from transylvania university... she and her husban