Britain's UN ambassador said senior officials of the six major powers held a conference call Wednesday on possible new U.N. sanctions against Iran for its nuclear program.

Ambassador Mark Lyall Grant told reporters that political directors from the five permanent Security Council member nations, plus Germany, spoke together on Wednesday.

"I have not had full readout of that meeting yet," said Mark Lyall Grant. "But they have agreed they will have a further discussion of possible measures early next week."

Those possible measures include new sanctions against members of Iran's powerful Revolutionary Guards Corps as well as sanctions against Iran's insurance and shipping sectors.

Security Council member China, which has been the most reluctant of the six to support new sanctions against Iran, took part in Wednesday's conference call.