Secretary of State Hillary Rodham Clinton is urging Iran to seize a chance in Istanbul this weekend to credibly address concerns about its nuclear program.

Speaking in Washington after a two-day meeting of the Group of Eight leading industrialized democracies, Clinton told reporters, “We are receiving signals that [the Iranians] are bringing ideas to the able.”

She said the G-8 hopes this weekend’s talks create an environment for diplomatic breakthroughs with Tehran. Clinton added that Iran must demonstrate it is serious about negotiations.

The imminent talks are taking place amid increased speculation that Israel or the US could take military action if Iran does not halt its uranium enrichment.

The US and many other countries fear Iran is trying to develop nuclear weapons. Tehran insists the country’s program is for peaceful purposes.

The G-8’s members include Britain, Canada, France, Germany, Italy, Japan, Russia and the US.