Department of Homeland Security and FBI issue security warnings . No credible or specific terrorist attack occurs at this time , agencies say . It said hotel owners can protect their properties by installing fencing or walls around the buildings and populated areas ; implementing random screening of people and their possessions ; and training security staff . Crowds at stadiums , hotels attract terrorist attention , agencies say .
Department of Homeland Security and FBI issue security warnings . No credible or specific terrorist attack occurs at this time , agencies say . Crowds at stadiums , hotels attract terrorist attention , agencies say .