The Bush administration May 30 dropped the federal terrorism alert level to yellow - saying intelligence pointing to an imminent attack has decreased. The higher orange alert lasted 10 days. No domestic terrorist strikes were attempted during that period.

"The intelligence community has concluded the number of indicators and warnings that led to raising the threat level have decreased, and the heightened vulnerability associated with the Memorial Day holiday has passed," said Brian Roehrkasse, spokesman for the Department of Homeland Security, as reported by The Associated Press.

The new level, yellow, indicates an elevated risk of terrorist attack, while the old level, orange, means a high risk.