An Iranian spokesman called on European negotiators Sunday to show "more seriousness" in talks about the Tehran's nuclear program and said Iran had kept its commitment to suspend its uranium enrichment program. "There is no doubt that Europeans have to show more seriousness. We hope Europeans will pursue talks with greater activity," said Foreign Ministry spokesman Hamid Reza Asefi in a press conference. Asefi also denied reports on Friday from diplomats in Vienna, citing U.S. intelligence reports, who said Iran was testing some parts of centrifuge machines that are used to enrich uranium, the material for producing fuel for nuclear reactors or atomic bombs. "The report is not true. We remain faithful to our commitments. There has been no violation on the part of Iran," he said. Asefi said a new round of nuclear talks with Europeans will begin Monday. Iran repeatedly has denied allegations of a secret nuclear weapons programs, saying its nuclear activities are for peaceful energy purposes "Negotiations have not reached a deadlock. Talks are continuing. A new round of talks will begin Monday," Asefi said. "We don't want concessions from Europeans," said Asefi. "We want our rights. That we possess peaceful nuclear technology is not a concession for Iran. ... We will not relinquish our rights." Under international pressure, Iran suspended uranium enrichment and all related activities in November to build trust and avoid U.N. Security Council sanctions. The IAEA agreed to police the suspension of Iran's nuclear activities and Iran has said it will decide within three months whether to continue suspension.