US President Mr George W. Bush is meeting with advisers, seeking details of an American Airlines plane crash in New York.
He postponed a scheduled interview with Russian and American reporters so he could monitor the investigation into the crash of Flight 587.
He meets tomorrow with Russian President Mr Vladimir Putin, opening three days of talks in Washington and Texas.
Intelligence agencies, the FBI and the Federal Aviation Administration are reviewing all recent intelligence for any signs that terrorism was involved.
An hour after the crash, there was no evidence pointing to an attack, said a US official.
"They are comparing information to see if it provides any insight into what transpired. At this point, there's no indication of a terrorist attack, but it certainly can't be ruled out in current environment," the official said.