The Foreign and Commonwealth Office is advising travellers to stay away from Iran.

On Saturday night the FCO upgraded its official advice, warning against ‘all but essential travel’ to the entire country. It is the first change to the FCO’s overall advice since Iran was plunged into turmoil following disputed elections on 12 June. Mass demonstrations in Tehran over the weekend claimed at least ten lives, and the situation in the capital remains highly volatile.

Tour operators contacted by Wanderlust were not taking bookings for the immediate future. Cox & Kings has two tailor-made groups currently in Yazd, but no further departures planned until September. Iran specialist Kootch Adventure Travel has no clients currently in the country. “We have had interest over the last few weeks, but we have said we’re not going to risk it,” said Iranian-born MD Alí Hendessí.

Tourism to Iran has been soaring in recent years, with the Iranian government reporting twice as many visitors in 2007 as in 2004. Many UK operators were increasing their tours to the country, which boasts unrivalled historical sites, varied landscapes and – in Mount Damavand – Asia’s highest volcano.

The peak seasons for travel are spring and autumn, and operators will be monitoring the political situation ahead of September departures.

In the short term, a general strike is one possible result of continuing unrest, according to Hendessí. “There are already reports of fuel shortages, and if the oil workers strike, the logistics of travel would become a nightmare,” he warned.