US President George W. Bush threatened on Tuesday to seek more sanctions against Iran for its nuclear program.

"A group of countries can send a clear message to the Iranians," Bush said, referring to a new proposal from Britain, China, France, Germany, Russia and the United States.

US President George W. Bush (C) walks to a meeting with European Commission President Jose Manuel Barroso (L) and Janez Jansa (R), prime minister of current European Union president Slovenia, at Brdo Castle during the US- EU Summit, June 10, 2008. (Xinhua/Reuters Photo) 

"And that is: we're going to continue to isolate you, we'll continue to work on sanctions, we'll find new sanctions if need be if you continue to deny the just demands of a free world, which is to give up your enrichment program," Bush told a press conference after a summit meeting with European Union (EU) leaders.

"Iran with nuclear weapons will be incredibly dangerous for world peace," he warned.

The new proposal will be presented soon to Iran by EU foreign and security policy chief Javier Solana.