The bodies of five Afghans who died in a car crash near the Iranian capital, Tehran, have been returned to their families.
The families of the victims told the BBC Pashto Service that the men, mostly from Nangarhar province, were being smuggled into Europe via Iran.
The bodies were handed over to Afghans by Iranian authorities in Nimroz.
Three other Afghans were also injured in the incident.
Iran is the most important route for Afghanistan and Pakistan to reach Europe illegally, but this deadly route is always full of bloody incidents.
Delaro, a resident of Hesarak in Nangarhar, whose brother was killed in the incident, said the injuries of the three Afghans were serious.
Mr Dalero, who had gone to Nimroz to retrieve the bodies, said the bodies had been left for several nights before being handed over to families.
Similar incidents have taken place in the past in Iran and especially on the border between Iran and Turkey in which Afghan refugees have been killed and injured.
The New York Times reported last month that nearly one million Afghans have fled to Iran since the Taliban took control of Afghanistan.
Some Afghans who do not have the money of smugglers to go to Europe have told the BBC that they first work in Iran for a while and try to find enough money there to go to Istanbul and then to European countries.
One reason may be that large numbers of Afghans have been smuggled into Iran in the past few months.
Every week thousands of Afghans are deported from Iran to Nimroz and Herat, and some Afghans, who have no other means of subsistence, try their luck again on this deadly route.
Unemployment in Afghanistan has risen sharply.
The International Labor Organization (ILO) said in a recent report that by the middle of this year, the number of people in Afghanistan who have lost their jobs since last August could reach one million.
As a result, more Afghans may have to flee to neighboring countries, including Iran, for work, something their neighbors are worried about.
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