The indication was given by U.S. State Department spokesman Richard Boucher, who said: "I haven't heard anything different. But I guess the Olympic committee would probably be able to tell you that."
Greek Minister of Public Order George Voulgarakis met with Deputy Secretary of State Richard Armitage Thursday and "discussed Greek Olympic security efforts and our contributions to it," Boucher said.
Voulgarakis told reporters no one has suggested al-Qaida or other terror groups had an active presence in Greece.
But three bombings in Athens Wednesday sent jitters among the organizers and participants, even though no one was killed in those blasts.
As this will be the Olympics first since the Sept. 11 attacks, they fear terrorists could target participants, particularly those from the United States.
Greece has a record $1.22 billion security plan for the games.