Security is being ramped up at federal buildings and airports across the U.S. in response to last week's attacks in Paris, the nation's top homeland security official said Monday.
The new measures are also being taken, Johnson said, because of “the recent public calls by terrorist organizations for attacks on Western objectives, including aircraft, military personnel and government installations and civilian personnel.”
Johnson also directed the Transportation Security Administration to immediately conduct a short-term review to determine whether more security measures are necessary at airports in the U.S. and overseas.
The U.S. government also boosted security at federal buildings after the October shooting at the Canadian Parliament building in Ottawa that killed one soldier. Johnson again cited that shooting in Monday's announcement, as well as last month's hostage situation at a chocolate shop and cafe in Sydney, Australia.