The FBI is warning that more terror attacks may occur on U.S. soil and against U.S. facilities overseas "over the next several days."
"Certain information, while not specific as to target, gives the government reason to believe that there may be additional terrorist attacks within the United States and against U.S. interests overseas over the next several days," the bureau said in a statement Thursday. "The FBI has again alerted all local law enforcement to be on the highest alert and we call on all people to immediately notify the FBI and local law enforcement of any unusual or suspicious activity."
Other than that, bureau officials would not elaborate.
The new warning came as U.S. officials ratcheted up security on Capitol Hill in Washington and elsewhere.
Capitol police put new concrete barriers on the roads around congressional offices, and workers placed huge concrete planters along the perimeter of the Capitol grounds.
The heavy planters would prevent a truck bomb driving up over the existing barrier, which is only a couple of feet high and slants inward.
-- How has your life changed since Sept. 11? Are you more aware of your surroundings, or what's going on around you? Why or why not?
THANKS BUT NO THANKS
The Twin Towers Fund has rejected a $10 million donation from a Saudi prince because of his comments about U.S. foreign policy.
New York City Mayor Rudolph Giuliani said the charity -- created after the Sept. 11 terrorist attack on the landmark buildings in Manhattan -- declined the donation after the prince said in a statement that the United States should have a more balanced stance toward the Palestinian cause.
"I entirely reject that statement, it's totally contrary to what I said at the United Nations, that is there is no moral equivalent for this act. There is no justification for it," Giuliani said. "The people who did it lost any right to ask for justification for it when they slaughtered four or five thousand innocent people and to suggest that there's a justification for it only invites this happening in the future.
"It is highly irresponsible and very, very dangerous and one of the reasons I think this happened is because people were engaged in moral equivalency, not understanding the difference between liberal democracies like the United States, like Israel and terrorist states and those who condone terrorism. So I think that not only are those statements wrong they are part of the problem," the mayor said.
Giuliani told the UN General Assembly on Oct. 1 that the United Nations must hold accountable any country that supports or condones terrorism.
Prince Alwaleed Bin Talal Bin Abdulaziz Alsaud -- listed by Forbes magazine as the sixth wealthiest man in the world -- attended a memorial service at Ground Zero Thursday, exactly one month after the terrorist attacks. He gave Giuliani a check for $10 million for the Twin Towers Fund, a fund started by the mayor to aid the families of city workers who lost a family member at the World Trade Center.
But an aide traveling with the prince distributed a statement to the media that spurred refusal of the check.
"However, at times like this one, we must address some of the issues that led to such a criminal attack," Alwaleed said in the statement. "I believe the government of the United States of America should re-examine its policies in the Middle East and adopt a more balanced stance toward the Palestinian cause. ... Arabs believe that if the U.S. government wanted, it could play a pivotal role in pushing Israel to sign and fully implement a comprehensive peace treaty. We want bloodshed to stop and we want to start working for a better Middle East."
-- What do you think? Should Giuliani have accepted the donation anyway? Why or why not? What about what the prince said? Do you agree with it?
Notable deaths of 2014 [PHOTOS]