WASHINGTON, July 21, 2008 (AFP) - The White House on Monday signaled that it expected Iran to reject a US-backed incentives package to end sensitive nuclear work and warned Tehran may therefore face additional sanctions.

"It is the position of the P5-plus-one that Iran should suspend its uranium enrichment, that we provided a very generous incentives package that they apparently are going to miss an opportunity to accept," said spokeswoman Dana Perino, referring to the five permanent UN Security Council members and Germany.