US urges vigilance after London bomb defused

The US government is urging Americans to be vigilant about suspicious activity after the British bomb discoveries, but officials said they saw no terrorist threat in the United States ahead of next week's July 4 Independence Day holiday. Homeland Security Secretary Michael Chertoff said there were no immediate plans to raise the US national threat level, currently at yellow, or elevated. Even so, a Cabinet-level meeting was called at the White House late Friday to discuss the developments in London. President George W. Bush was first briefed by National Security Adviser Stephen Hadley in Kennebunkport, Maine, where Bush will meet Sunday with Russian President Vladimir Putin.