President Barack Obama and the leaders of France and Britain will accuse Iran at the opening of the G-20 economic summit Friday of building a secret facility to produce nuclear fuel, a senior White House official told The Associated Press.

The official said the three leaders — Obama, British Prime Minister Gordon Brown and French President Nicolas Sarkozy — will demand that Tehran open the covert facility up to inspections by the International Atomic Energy Agency.

Iran has kept the facility, 100 miles southwest of Tehran, hidden from international weapons inspectors for years, but the U.S. has long known of its existence, the official said.