Talks aimed at resolving tensions over Iran's nuclear program are entering an unscheduled second day. However, both sides remain at odds over a demand that Tehran stop a process of uranium enrichment.
The negotiations in Baghdad were expected to continue on Thursday, despite new proposals from the West being described by Tehran as "not useful."
The so-called P5+1 group of powers, including Germany, presented a package that demanded a halt to Iran's project to enrich uranium to a 20 percent level.
Such refining of the process would make the production of weapons-grade material more possible, although Iran denies its program has a military application.
"We hope that the Iranians will come back with a positive reaction to our proposals," said EU spokesman Michael Mann, on behalf of the P5+1 group.
However, Iran appeared to reject the demand outright. "The proposals contain nothing new, they are unbalanced and therefore they are not useful," the state-run news agency IRNA cited an Iranian delegation source as saying.
The P5+1 group includes the five permanent UN Security Council members - Britain, China France, Russia and the US – as well as Germany. Talks on Wednesday were being led by EU foreign policy chief Catherine Ashton.
Enrichment of uranium to make it 20 percent "fissile" - capable of sustaining a chain reaction - is viewed as indicative of Tehran overcoming key technical hurdles in manufacturing 90 percent weapons-grade material.
Iran claims to be enhancing fissile purity to a level necessary for medical research and has repeatedly ruled out suspending its enrichment program in accordance with several UN Security Council resolutions.
rc/slk (AP, dpa, Reuters)