Oct 30 (Reuters) - Qatari mediators returned to Tehran on Friday as part of efforts to reach a deal between the US and Iran, an official briefed on the talks told Reuters.

The mediation talks have been coordinated with the US, the official said.

Qatar presented a draft peace plan to Iran on Sunday, according to an official briefed on negotiations. But a senior Iranian official dismissed the proposals as unacceptable and said Tehran would maintain its nuclear position.

Washington wants nuclear issues included from the start of negotiations. Tehran demands that the US first end its port blockade and lift oil export sanctions.

Iran's Foreign ​Minister Abbas Araqchi said on Wednesday that Tehran remained in close contact with intermediaries to review ideas that could ensure the implementation of its own seven-day proposal aimed at ending the ​war in the Middle East.

On Thursday, President Donald Trump said Vice President JD Vance's outreach to Iran concerned medical supplies, following US media reports linking it to efforts to revive peace talks.

(Reporting by Andrew Mills; Writing by Tala Ramadan; Editing by Christian Schmollinger)