Image copyright Tasnim News Agency/Reuters Image caption Vahid Mazloumin (R) was said to have amassed two tonnes of gold coins 
 
 Iran has executed a currency trader known as the "Sultan of Coins" for amassing some two tonnes of gold coins. 
 
 Vahid Mazloumin and another member of his currency trading network received the death penalty for "spreading corruption on earth". 
 
 According to the Iranian Students' News Agency, Mr Mazloumin and associates had hoarded the coins to manipulate prices. 
 
 Rights group Amnesty International described the executions as "horrific" and a violation of international law. 
 
 "Use of the death penalty is appalling under any circumstances," Amnesty said in a statement on Wednesday, adding that under international law "the death penalty is absolutely forbidden for non-lethal crimes, such as financial corruption". 
 
 Amnesty went on to say that the manner in which the trials were "fast-tracked" displayed a "brazen disregard" for due process. 
 
 How did these executions come about? 
 
 Mr Mazloumin was arrested in July for operating as a speculator and accused of hoarding gold coins with the aim of later manipulating prices on the local market. 
 
 In August, Iran's Supreme Leader Ayatollah Ali Khamenei approved a judicial request to set up special courts to deal with those suspected of financial crimes. 
 
 Since then, these courts have sentenced several people to death in trials often broadcast live on state television. 
 
 The second man executed, who was also convicted of "spreading corruption", was linked to Mr Mazloumin's network and was reportedly involved in the sale of gold coins, according to Mizan, the official website of Iran's judiciary. 
 
 Both men were executed by hanging. 
 
 Why are gold coins in high demand in Iran? 
 
 Demand for gold coins and US dollars in Iran has soared as the country's currency has declined in value. 
 
 In the wake of the latest round of US sanctions on Iran, the rial has fallen about 70% against the US dollar, while gold coins have grown more expensive. 
 
 Image copyright Getty Images Image caption Gold coins have increased in value as Iran's currency, the rial, has fallen 
 
 As a result, a cost of living crisis has seen demonstrators take to the streets against perceived corruption. 
 
 The tough US sanctions on Iran target the country's oil and finance sectors. Iran is heavily dependent on its exports of oil, and the renewed sanctions, if effective, would cause yet further damage to the economy. 
 
 Tehran has been battling instability in its financial markets since April, when the government attempted to stabilise currency prices by introducing a single official dollar exchange rate. ||||| Just a day earlier, traders said, about 130 small-time currency and gold dealers were arrested in downtown and the nearby Grand Bazaar. The rial was trading at 12,900 to the dollar on Wednesday, slightly better than the day before — but down from about 40,000 a year ago.
– Iran has executed the so-called “Sultan of Coins” for the crime of “spreading corruption on earth.” Per the BBC, Vahid Mazloumin was convicted of hoarding gold coins to manipulate prices. He and another financial trader, Mohammad Esmaeel Qasemi, were hanged after the Iranian Supreme Court upheld the convictions, the Los Angeles Times reports. A third person, who also was convicted, has an appeal pending. According to state media reports, Mazloumin, 58, amassed two tons of gold coins. He was reportedly arrested in July and later tried by a special court recently set up to adjudicate suspected financial crimes. Several other people, often in televised trials, have also been convicted and sentenced to death, according to reports. Earlier this year, financial traders in Iran did “brisk business,” per the Times, as financial mismanagement by the government and renewed US sanctions decimated the Iranian rial and many people traded their cash for dollars or gold. The Iranian government blamed traders for the currency crisis and shortages of basic items, such as medicine and diapers, leading to police raids and the establishment of the special courts for economic crimes. Amnesty International tells the BBC that the resulting executions are “horrific,” saying that international law forbids the death penalty for “non-lethal crimes, such as financial corruption.” (Iran warns of "war situation" amid renewed sanctions.)