Ambassadors from six world powers reached agreement in principle Wednesday on a proposed new package of sanctions against Iran and expect to introduce a resolution to the Security Council on Thursday if their governments give a green light, the US ambassador said. Approval by the governments of the United States, China, Russia, Britain, France and Germany would be an important first step. The package would still need to be considered by the 10 non-permanent members of the UN Security Council who have not been part of the negotiations. Nonetheless, an agreement by the five veto-wielding permanent members of the council and Germany would be a strong signal to the other council members of the unity of the key nations on the UN's most powerful body - and a sign that they want to send a united message to Iran to suspend uranium enrichment. "We have an agreement in principle based on some additional changes that were introduced and presented today by some delegations," acting US Ambassador Alejandro Wolff said. "So it's new elements and understandings that need confirmation from capitals. But it is a package approach that, if approved by capitals, would be essentially the way forward in a resolution."