British diplomat John Sawers says Iran presented no major new proposals at Monday's last-ditch talks aimed at resolving the standoff over Iran's nuclear program.
But Iran's negotiator Javad Vaeedi described the session with Britain, Germany and France in Brussels as positive.
The talks came before Monday's meeting in London of the five permanent members of the U.N. Security Council and Germany on Iran's nuclear program.
President Bush, speaking at the White House, said there is an international consensus that Iran should not be allowed to develop a nuclear weapon. He says U.S. and other officials are working on how to go about achieving that goal.
Later this week, the International Atomic Energy Agency holds an emergency session that could see Iran referred to the U.N. Security Council for possible sanctions.
Some information for this report was provided by AFP, AP and Reuters.