Representatives of six world powers urged Iran on Friday to accept a U.N. plan aimed at delaying its ability to build a nuclear weapon, as the head of the U.N. nuclear watchdog agency warned Tehran not to miss the opportunity to resolve the dispute.

Officials from six countries and the European Union expressed disappointment that Iran had not accepted a deal to export most of its enriched uranium.

The U.N. General Assembly's human rights committee condemned Iran on Friday for a violent crackdown on protesters after presidential elections this year that the Iranian opposition says were rigged.

A key U.N. committee approved a resolution Friday urging Iran to halt the persecution of political opponents following the country's disputed presidential election.

While Tehran pushes to renegotiate a deal on nuclear fuel, the U.S. is pushing for more sanctions. Iran seems to be betting that it can withstand whatever Washington can muster

A UN panel on Friday blasted Iran for "serious, ongoing and recurring" human rights violations, including violence against protesters after the disputed June presidential elections.

Major world powers expressed disappointment Friday that Iran has "not responded positively" to a plan for resolving the standoff over its nuclear programme or agreed to new talks.

Iran's President Mahmoud Ahmadinejad on Friday urged Turkey's visiting Foreign Minister Ahmet Davutoglu to increase trade ties between the two countries, the president's office said in a statement.

Senior officials from six world powers said on Friday they were disappointed Iran had not accepted proposals intended to delay its potential to make nuclear bombs, and urged Tehran to reconsider.

Representatives of six world powers and the European Union met in Brussels on Friday to discuss Iran's apparent rejection of a key part of a nuclear deal.