WASHINGTON ( CNN ) -- The Department of Homeland Security and FBI have issued security bulletins to raise awareness regarding `` terrorist interest '' in attacking sports and entertainment venues as well as luxury hotels . The bulletins , which were sent to law enforcement Monday , said that authorities did not know of any credible or specific terrorist plots to attack U.S. stadiums , arenas or luxury hotels . However , it said that terrorist groups such as al Qaeda view crowded stadiums and arenas as potential targets . It said hotels are also attractive targets for terrorists . The Department of Homeland Security said it released the notes to assist law enforcement partners as they go about their daily duties . `` While DHS and FBI have no information regarding the timing , location or target of any planned attack , we believe it is prudent to raise the security awareness of our local law enforcement partners regarding the targets and tactics of previous terrorist activity , '' the department said . The bulletins did not mention the recent arrest of three men in connection with what the Justice Department has said was a plot to detonate bombs in the United States . The men are charged with lying to federal agents during the probe of the alleged plot . The bulletin on stadiums and arenas said that previous attacks against crowd gatherings have included improvised explosive devices and car bombs , `` tactics that are also applicable to many stadiums and arenas . ... `` Detained terrorists have also discussed the use of aircraft and chemical weapons to attack stadiums and arenas. `` It said the al Qaeda training manual lists `` 'blasting and destroying the places of amusement , immorality and sin ... and attacking vital economic centers ' as a key objective . '' The bulletins on luxury hotels said analysis of previous attacks abroad and thwarted plots showed that terrorists have used paramilitary and `` small unit '' tactics , explosives , improvised explosive devices and car bombs . 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 .
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 .