Iran nuclear talks deadline postponed 'yet again' to reach 'political understanding'

Day after the March 31 deadline to reach an agreement on Iran's nuclear program was extended by a day, the United States has now said that talks will continue until at least Thursday morning, two days after the original deadline.

A U.S. State Department spokeswoman was quoted as saying on Wednesday evening that the western nations and Iran continued to make progress but have not reached a political understanding. She added that U.S. Secretary of State John Kerry had therefore, decided to prolong his stay in Lausanne until at least Thursday to continue negotiations, reported the BBC.

The news came even as a number of foreign ministers left the talks and China warned that compromise was essential, otherwise "all previous efforts will be wasted."

The P5+1 nations, including, the U.S., the United Kingdom, France, Germany, Russia and China, accuse Iran of building nuclear weapons under the pretense of developing its nuclear capabilities for civilian purposes. They want Tehran to curb its nuclear ambitions in return for the lifting of United Nations sanctions.