Ninety thousand people have so far been forcibly returned to Afghanistan from Iran since 21 April, according to the United Nations High Commissioner for Refugees.
Every hour or so another bus arrives on the Iranian side, the people are unloaded, carrying the few possessions they had when they were arrested.
A policeman meets them on the Afghanistan side, and they join a long line of people waiting to pick up the few pieces of charity an aid agency has gathered for them.
They get water, biscuits and a bundle of clothes. They can also make a free phone call to relatives to let them know where they are.
Then they get a free 120 km bus trip from the border post to the city of Herat where they are left to start all over again in a country where they used to live.
In the gathered crowd waiting to tell their stories I see a young man, a tear rolling down his cheek.
"My wife and children are left there, even though I asked the authorities to let us go together," he said, a reference number scrawled on his hand in thick black ink.
"I didn’t even have time to get my wages from my employer. Now that they deported me who will look after my children? If someone throws them on the street who will give them shelter? This is cruelty."
Among the lines of men was a 12-year-old boy who said he h