A U.S. official said the plane had apparently violated all the requirements.

He further added the plane "has in the past repeatedly violated our airspace.

It was not immediately clear if the plane violated the ban on flights over certain areas of Bosnia.

If this was the case, the plane would not have necessarily violated the "no flight" zone over Bosnia.

Three planes violated that order and were forced down by American military aircraft that day.

Since then, there has not been any fighting, but Libyan planes have repeatedly violated Chad's air space to conduct surveillance flights.

India also accused that the plane violated a bilateral agreement signed between India and Pakistan in 1991.

Chinese authorities insist that the American plane violated its air space.

"If other planes violate the agreement, they will be shot down," Mr. Bush said.

"The American plane seriously violated aviation rules and should take the full responsibility for the incident," he said, echoing the government's official account.