World powers resumed negotiations with Iran on Wednesday over Tehran’s peaceful nuclear program, more than three weeks after they last met and gave themselves another seven months to strike a deal.

World powers resumed negotiations with Iran on Wednesday over Tehran's peaceful nuclear program, more than three weeks after they last met and gave themselves another seven months to strike a deal.

Political directors of the five permanent members of the UN Security Council and Germany -- the so-called P5+1 -- are holding a one-day meeting in Geneva with the Iranians, mediated by the European Union.

An EU spokeswoman in the Swiss city told Agence France Presse the talks had begun, without giving further details. No announcements are expected after the discussions conclude.

The US and Iranian delegations met on Monday and Tuesday in Geneva in preparation for the multilateral talks, led by Acting Deputy Secretary of State Wendy Sherman and Iran's deputy foreign minister Abbas Araqchi.

The P5+1, which comprises China, the United States, France, Russia, Britain and Germany, last held formal talks with the Iranians last month in Vienna.

All parties agreed to give themselves seven more months - until June 30 - to strike a deal, although they said they hoped to have the broad outlines hammered out by March.

Iran strongly denies that it is seeking nuclear bomb and insists its nuclear activities are for solely peaceful purposes.