The U-S State Department has issued an urgent warning to U-S citizens, telling them that military strikes underway in Afghanistan could lead to new anti-American terrorist strikes.
The warning says the U-S-led military action could spark strong anti-American sentiment and retaliation against U-S citizens and interests throughout the world by persons sympathetic to Osama bin Laden.
Any Americans still in Afghanistan are told to leave, and Americans abroad elsewhere are advised to monitor the local news, limit their movements and keep in close touch with the nearest U-S embassy.
In his earlier address to the nation, President Bush said Americans must be prepared to make sacrifices and be patient with tighter security.
Later, U-S Defense Secretary Donald Rumsfeld says the best way to protect Americans against terrorism is to go after terrorists where they exist. He said the U-S military, F-B-I, and intelligence agencies cannot defend every possible target of terrorism.
U-S officials say Vice President Dick Cheney has been moved from his White House office to a secure, undisclosed location.
On Monday, former Pennsylvania Governor Tom Ridge begins his job as the head of the Office for Homeland Security -- a new cabinet-level post President Bush created after the September 11th attacks.
Separately, Democratic Senator Bob Graham said Americans must be vigilant for many different forms of terrorism other than airline hijackings.
Richard Shelby -- the top Republican on the intelligence committee -- said he cannot say when or where another attack might take place.
Republican Senator Trent Lott said Americans should go on with their lives the best they can without taking what he called, "stupid risks."
Late last week, workers n the U-S Capitol began installing a shatter-resistant coating to windows to protect workers and visitors to the building.