A British Parliament delegation has arrived in Tehran, the first visit to Iran by UK politicians in years.
Iran's official news agency, Irna, said today that the four-member group is headed by former foreign secretary Jack Straw, who last visited Iran in 2003.
The British Embassy in Tehran was closed in late 2011 after hardliners overran the building. Iran also closed its embassy in London but relations have improved in recent months.
The visit by the British parliamentarians is the fourth by politicians from Europe since Iran's new president, moderate Hassan Rouhani, took office in August.
Mr Rouhani has vowed a softer approach toward the West, which is at odds with Iran and suspects the country of developing a nuclear bomb. Tehran denies the charge.