article: At every border along the refugee trail, through Macedonia, Serbia, Croatia, Slovenia, Austria, Germany, Denmark and Sweden, the welcome is cooling, the checks are getting tougher, and people are being turned back. Here at Idomeni there is just one small gate, right by the railway line, where refugees can pass. A Macedonian policeman, with a magnifying glass in hand, stands by it, scrutinising the documents of every single person attempting to cross. The refugees wait in line for their turn. "You, you can pass," the policeman says to a family with small children. They shuffle through. "You. No," says the policeman to a young Middle Eastern man. He turns back. Young men in particular are facing more scrutiny. Those fleeing conflicts in Syria, Afghanistan and Iraq are supposed to be allowed through. Everyone else is being stopped. Just a couple of seconds are spent peering at each set of papers. "You. No valid documents," says the policeman to an old lady in a headscarf. "This is fake," he adds, holding her identity card. It says she's Syrian. She speaks no English and looks confused. Migrant crisis explained in maps and graphics More than one million migrants reach Europe by sea in 2015 Cologne sex attacks and their profound effect on Europe Macedonian soldiers lean against a vehicle watching, guns slung from their shoulders. A UN refugee agency staff member standing nearby does not intervene. Many who are not from Syria, Afghanistan and Iraq are now trying to get through with forged papers. Sifting the genuine refugees from impostors isn't easy. One group showed their Syrian passports, but their identity papers obtained in a Greek refugee camp did not have the proper stamps. Among them was a man, limping, his leg set in a metal brace. "You have to go to Athens, get papers there," a Greek policeman told him. Athens is 500km (310 miles) to the south. But those denied passage are not deterred easily. In the woods near the border we found dozens of migrants, camping out. They were outside in freezing temperatures, hiding from the police, preparing to skirt the official crossing, to enter Macedonia illegally. There were Libyans, Iranians and Moroccans, along with Indians, Somalis, even a refugee from Western Sahara who had crossed North Africa hanging on to the underside of a truck. They were all wrapped in blankets to protect themselves from the cold. One man, singing a lament, was from Afghanistan. But he was darker-skinned than most Afghans, so the Macedonian border guards had refused to believe his papers and turned him back too. Among a group of Pakistanis warming their hands by a fire we found Sami from Lahore. He'd worked as a chef in a restaurant. But, he said, his boss rarely paid him, so he had left his wife and three-year old son behind to make this journey. "It's very hard," Sami told me. "It's cold. I have no food, no drink, no money in my pocket, all finished." He has spent $4,000 (Â£2,770; â‚¬3,700) and 15 days in jail in Turkey to
summary: Running in looping coils, razor-wire now stretches along part of Macedonia's border with Greece.